My family found a tiny Green Tree Frog, and I'm thinking of keeping it. But i need to know if it could live with any of my other frogs, i don't want to make another habitat just for it.

I have a Great plains toadlet, about half the size of this frog, with a small habitat with paper towel substrate.
My other frog is a Fire bellied toad at least three or four times the size of this frog, Her (we believe it's a 'her') habitat is a fairly large terrarium that's half rock and half water.

Would it live happily in any of these habitats or would it be happier for me to just let it go?

EDIT: I'm so sorry,the frog isn't a green tree frog, as I've just discovered, it's actually a Bird-voiced tree frog. Which i suppose has different needs.