Hello and welcome to FF ! People do keep them; but with the rare exception, mixing them usually ends bad when frogs are involved. Integrating species in an enclosure faces meeting space requirements for all frogs involved; matching activity and eating aggressiveness; dealing with individual frog toxin buildup in wet and dry areas; and matching environmental parameter needs. Even when all before mentioned challenges have been solved; you still need to get lucky and find individuals that will not stress each other out due to continual contact inside enclosure .