I believe those are leaf-footed bug nymphs, squash bugs, stink bugs, etc. They live off the fluids of plants so yes they will be happy to suck tomatoes. Keep an eye on the plants, since they just hatched they should be dispersed in a day or two, if not already. If you need to control them then, then address it but more than likely they will spread out. I personally don't really consider leaf-footers garden "pests".

they are pests, they will destroy most fruits in your garden.

Just my 2 cents
Might be wrong
But they look like Assassin Bug nymphs to me

If so they eat other bugs & shouldn't harm your plants
???

PS~
Being in Texas they can also be Wheel Bug nymphs
Which is a type of Assassin Bug

Here is a link that might be useful: Pics

I should have added that I don't grow tomatoes because I don't eat tomatoes (weird right...I know) so I haven't had to deal with *any* pests on my tomatoes, therefore I can't talk specifically to how bad leaf-footers are on them.

It would be great if they were assassins but there appears to be many in close proximity and the the two black dots on the abdomen IDs them as leaf-footers :(

http://www.entnemdept.ufl.edu/creatures/orn/leaffooted_bug.htm

http://erec.ifas.ufl.edu/tomato-scouting-guide/bugs/leaffooted-bugs.shtml

Those aren't assassins. Chemical warfare is necessary if you want a decent crop. I'm on the Texas gulf coast and those vermin visit us every year.

There was a thread about how to control stink bugs earlier in July that spoke of a way to blow Diatomaceous earth onto tomato plants which the poster had found to be successful. It also contains some informative links.

A different kind of stink bug is discussed here, but you might want to check out these ideas for control:

http://www.wikihow.com/Get-Rid-of-Stink-Bugs-Naturally

Here is a link that might be useful: Earlier thread:

I thank everyone for trying to help me with the Tomato bug problem.
I suspect the bugs to be pests.
I had noted several tomatoes deformed and damaged in this plant before I saw the bunch of these menacing insects with two separate dark spots on its abdominal region and orange yellow skin color as seen in the image. After reading your answers I took some more photos, pushed some of the insects into an oiled container for closer examination and plucked one tomato with several of these bugs crawling on it. On that tomato, I saw a dark and an orange-yellow insects joined in copulating position while a dark one was seen crawling a little away. I also saw a round depressed scar and a thick linear scar extending from it. Are these bugs the cause of the damage? I will try the Metro DataVac Electric Duster Vacuum cleaner method to physically remove the bugs. I will post back the result after a period of observation.

worst bugs ever! Leaf-footed bug, they look like some sort of dinosaur flying. Impossible to get rid of, I just pull the tomatoes when i see the first one. UGH!
Tally Ho!

Those do look like leaf footed nymphs. Permethrin works really well, as does cheaper sevin. You can go with the more manual plan to physically remove the bugs, but you won't get all of them.

Once again thank you very much for your valuable diagnosis and treatment recommendations.

If the physical methods of Pest removal fails, I may reluctantly use the Chemicals recommended. Mine is an organic back yard vegetable garden and I use only things like liquid soap and Neem oil spray for most of the pests. Although my cucumbers, Okras, Eggplants, Beans etc. are not very pretty looking or uniform in shape and size, we and our neighbours with whom I share the produce like them very much.

Well, if you're organic; try Pyrethrin. It's an unaltered chemical derived from chrysanthemum flowers - naturally occurring. It's only draw back is that it doesn't last long AT ALL. I'm currently using it and can vouch that it works. It can be used on fruits and veggies one day before harvest (again, because it doesn't last long).

One way to help combat these in the future is to plant chrysanthemum and marigold flowers in your garden - it's not a "cure all," but certain pests don't like these flowers!

I tried Water Jet, Hand picking and Electric Vacuum to fight the Leaf-footed Bugs infesting the 4 Solar Fire Tomato plants in my back yard garden. The plants had a heavy load of tomatoes of varying maturity. Finally I had to wave the white flag and pick all the green and partially ripe tomatoes to salvage what I could. See the image of tomatoes damaged by this disgusting bug. My garden had a lot of Merry Gold with flowers from the very beginning and I had hoped it would ward off these pests. The Plants are still the and I may try some chemical pesticides in one and leave the rest as controls and see if the bugs will attack again. Anyone has any other suggestions?