Quote Originally Posted by Karin View Post
His color is better (he was looking a little dull and gray earlier).
If this is the one from the picture, turning gray isn't a bad thing, it looks like a Gray Treefrog to me (Eastern or Copes, the appearance is similar and the care is the same). They change colours like we change clothes. See Frog Forum - Gray Tree Frog Care and Breeding for care info. You're fine without a heater, but I find they do head to the ground and burrow if the temperature or humidity drop.

I'd remove the poop on a daily basis as you see it, sitting on a leaf next to your own feces ain't cool.

Your brown one could be a Spring Peeper (<- a guess based on size, colour, stripeyness, and a list I found of Minnesota Frogs, Toads and Treefrogs)? Pics would be good for an ID. If it's a Peeper I would definitely not keep them together for size reasons, Peepers are small and delicate, grays could potentially get large enough to make a snack out of the peeper, but it sounds like you may have already figured that out after you got them home