I have 2 green treefrogs (each in a 10 gallon tank of their own). They seem to like the plants I have in their tank, their rock water dishes, and crickets. But be careful: when you first put them in the tank, they might try to jump out at first. Mine stopped doing that after a few months. Also, green tree frogs are nocturnal creatures and eat at night. But I've read that they can live for 10 or more years in captivity.

Yeah,they tried to jump out when I first got them, but know they seem really comfortable in there, check out my last post just below this one "new 55 gallon tank, what to do what to do" =)