Here is a nice article with some information on them: AmphibiaWeb - Polypedates leucomystax.

In general terms, tree frogs are nocturnal to a more or less degree. You can use red lights to observe at night, although some species will require complete darkness in order to become active. Once your shop get's them you can observe and make any comparison's with other available species. White's are very common due to their apparent tolerance to being handled.

Myself thinks the Golden Tree Frog are very handsome frogs. You have to decide on a species because mixed species tank usually turn into bad ideas with some of the frogs ending sick or dead .

Recommend conduct a full 30 day quarantine once you get them. Good luck !