After letting my toads grow for a while and making some observations recently, I now think I have American toadlets.

-Parotid glands seem moderately far away from the eyes. I can't see a cranial crest yet, but even if it was there, it looks like
there would still be space between the gland and the crest. You can see in this pic that there is a lot of space there:






-Speckled belly points to American. Fowler's have either a completely white belly, or 1 dark spot in the center:





-It looks like most dark patches of skin only have 1 or 2 warts in them. The first toadlet has some larger markings on its
back that are still a little questionable, but other than that it seems conclusive. Also, American toads have some
prominent warts on the back legs, but on a Fowler's toad, the leg warts are all uniform size:






I probably should have waited for them to grow a little bit at first before proclaiming them to be Fowler's,
but at the time I saw things that made me think I had a match, and they do look incredibly similar when they're so small.