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Frogs will actually sometimes evolve “odontoid serrations,” which are basically just bony serrations on their bones that may superficially look like teeth, but aren’t enamel or dentin, which are the tissue types that characterize true teeth.

It turned out that he had fractured his odontoid process--a little thumb of bone that sticks up from the second cervical vertebra.

The odontoid process of the axis is wide, flat, and hollowed above, as in the ruminants.

Odontoid, o-don′toid, adj. tooth-shaped: tooth-like.—ns.

The odontoid process of the second vertebra is pig-like: and the tibia and fibula and radius and ulna are severally distinct.