For the mixing I wouldn't put a pacman frog in with any other frog, frogs are one of the most common things these guys will eat in the wild. When he was big enough I could almost 100% guarantee that it would try to eat the whites if it happened to stroll by him. And if the pacman was to small to swallow it you could end up with 2 dead frogs or a dead frog and really injured tree frog. Because of the pacmans 2 big bottom teeth in the front of there mouth it sometimes prevents them from spitting large food items out so the frog ends up chokeing because the only option is for the meal to go down. This is actually the purpose of them, to help bigger meals from escaping. Unfortunately they sometimes bite of more then they can chew, or I guess you could say swallow.