As far as I know, all frogs secrete chemicles. It is just that some are stronger then others. The secretions from a Whites is not that strong but prolonged exposure to it by other frogs and possibly reptiles could still poison, it would/could just be a slower poisoning. Mixing species is something that I do not do, it would be cool but personally it is not worth the possibilty of harming a pet that I bought with the intention of giving them the best care possible. Like Arielgasca420 said "Thats a gamble you will have to take and see how it turns out.".