Most frogs have teeth. The teeth are found mostly in the upper jaw or the roof of the mouth and are too weak to do anything but hold onto the weakest prey. There are a few species of frog, however, that have fangs.
Only one type of frog, Guenther's marsupial frog, is known to have teeth in both the upper and lower jaw. The African bullfrog is a huge frog that has teeth-like structures in its lower jaw. These structures can hold onto strong prey till the frog eats it. Even frogs with teeth don't chew their food, swallowing it whole instead.