And frogs poop where ever!

Kisa, I think a ten gallon would be fine, especially for hypochondrialis and azurea, and possibly for tomopterna, but ask Mike Novy for sure. Your best bet for acquiring these frogs is from Mike, who is a member here. I have two beautiful hourglass treefrogs from him and I love them. As far as care goes for tomopterna, I think you can follow the red-eyed care article, but I would still consult with Mike as knows a lot more about this species than I.

I have heard of Prehistoric Pets and I believe there was a write up on them in Reptiles not too long ago.