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.