Pacs can and do bite to the point of drawing blood. It doesn't hurt, but it can break the skin. They have two small "fang" looking teeth on the bottom and a whole line of them around the top jaw, but they are so small you can not feel them, as they are only to help hold their prey.
Pyxies and pacman frogs do NOT have the same teeth. The pyxies have three on the bottom and are not sharp at all. However, the bite of the pyxie is much worse than the pacman. I have seen a pyxie actually split a thumbnail from one end to the other with it bleeding from under the nail.
If you do get bitten by a frog(especially a pac), do NOT try to force it off of your finger because you can do some damage to them in the process.
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