Hi!
Yeah, they're Whites Tree Frogs everywhere else but Australia I think,
Probably not a good idea mixing those species, one of the mixes I do know of that you can do is Marsh frogs and Southern Brown Tree Frogs. Hope you marsh frogs leg is okay!
Good luck constructing the tank, it's almost as addicting as frogs, .
I never thought I'd get so into frogs, and then from frogs get into reptiles, now I've got a house full of tanks, haha. So prepare yourself! :P
I'm sure everyone would love to hear more, and if you have the chance you should post some pictures
Good morning, have a good day