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Just to answer that question. When I had a young male, he bit me afew times when he was mad, or when he thought my finger was food. I doesn't hurt at all, but I have to admit, it can be somewhat startling. As long as you don't wiggle your finger in front of your Pacman Frog, it isn't likely to bite you. I always kind of laughed it off.
An older Pacman Frog bite isn't great, though. Older Pacman Frogs will develope an odontoid (tooth) in the center of it's mouth that is pretty sharp (so I've heard). I have heard people say that if adults bite they can hang on like anoles (green yard lizards). I wouldn't worry about that at all, it's just fyi.