I haven't tried it yet, but I would like to. Have you looked at Mike McGrath from You Bet Your Garden's article on toads? It has a lot of good information.

You can also listen to his radio show on the computer. It always has great information
You Bet Your Garden

Bellatrix

Here is a link that might be useful: Toads in the Garden

My garden always has lots of toads. They hatch from our pond, which is nearby our gardens. I can not think of a time that I went into the garden and did not see a toad.

So bagardens
With lots of toads do you have a snake problem while gardening?

George

I used them for slugs. I had mulched heavily and the slug population rocketed. One or two toads per bed (my daughter and her friends caught them), make a little burrow for them in the deepest shade (a broken, overturned, partially buried, small flower pot is just perfect) you can find. They do decrease the slug population.

George
We don't really have snake problems but we did have a snapper come visit us last year. We weren't too happy to see him.

I have a lot of toads and (harmless) snakes in my garden. As was mentioned earlier, keeping them around is a matter of environment. They need food and protection, so a conventional row garden with no place to hide and keep cool in the hottest part of the day is not going to keep them around. I grow in a French/Bio-intensive style so the foliage is thick and offers a lot of shelter.

The best part of having toads and snakes around was when my boys were little and they had the mom who was not only not afraid of such critters, but gladly picked them up and showed them to the kids before moving them to a safe place.

Yeppers, that's right. For a few short summers, I was cool. Then came puberty.

Kay

If you have toads in the area they will make a home in your yard/garden if the environment is right. They need a place to hide out that is cool. Underneath a shed, in some tall grass under a drippy water spigot etc.

I don't think I would go to the trouble of buying any, but it won't hurt to catch a few and relocate them in your yard, but if they aren't already there then there is a reason for that.