Two hawthorns, maybe a common lilac and a Norway maple. Only the hawthorn produces succulent fruits that might have been sown by birds.

Those 2 are hawthorns, not oaks? Really?
Lilac ... it's fairly near another lilac.
Norway maple? I'd love one of those!

Agree with hawthorns (probably Common Hawthorn Crataegus monogyna) and Norway Maple. #3 though has alternate, not opposite, leaves; I'd suspect a crabapple seedling or root sprout.

Resin

You'd love a Norway maple? I thought most people hated those.

Even if you would love to have a Norway maple, I would move it. If it is near any foundation - near defined as closer than 20' - it is too close. Move it now, while you can, if you can - it may be too hard to get out from where it is.

I love a lot of trees, always liked the big Norway maples. I'll transplant it in January when it is dormant. Don't really have even an inch anywhere for another tree unless it likes very wet standing water -- not the Norway. But will look for a spot.

Did plant a Weeping Crabapple, molten lava, but it's at the far end of the yard. Will have to transplant that newbie crabapple in January too. Wonder what type it is?

But the hawthornes .... drats .... no place for them, will have to dig them up in January and sneak them somewhere to plant.

THANK YOU FOR THE IDs !!!