Don't take this the wrong way, because I'm not trying to be a smart allic, I just want to be helpful. It's actually dumpy* tree frog, and "white's" treefrog is just another name for dumpy treefrog. They are the same species. The blue ones just come from a different part of the world. So yes, it is perfectly safe to put them together as long as they are both healthy and about the same size.
Sorry Cam, I couldn't resist....I think it's smart ALECK! I'm a bad speller too, I'm going to have to really watch myself here!
4.1.0White's Green Tree Frog (OliveR, Shrek, Skitter,Frankie,Storm)
0.3.0 Cats (Isis, Cleo, Sasha)
1.1.0 Bearded Dragon (Dexter,my girl)(Luci, my boy)