I wouldn't recommend mixing different frog species together. Frogs are more agressive towards other species than to their own, this can cause stress, which can lead to disease. I saw a few pet stores mixing golden bell and green tree frogs together. I tried this, the golden bell frogs sometimes try to eat the green tree. One day I found one of the golden bell frogs eating my green tree frog "Fred" (I had bought Fred from a pet store then found out he had rickets, a bone disease) I got his leg out the attacker's mouth and separated the breeds. Also, most frog's skin secretions are poisonous to some extent, one species may kill another with the chemicals secreted from their skin.
Although some people have had success mixing different species together, I wont be doing any trials
