They are so cute!!! Adorable!!!

The black and white ones, look like they could be either Barred rocks or Black stars. The whitish one is harder to Identify, could be just about anything, but Buff rock comes to mind.
If you want to see what chick breeds look like, check out www.Mcmurrayhatchery.com click on the day old chicks, and each breed will have a pic of the baby chicks.