bufonite

from The Century Dictionary.

• noun Toadstone; a fossil consisting of the petrified teeth of Sphærodus, Pycnodus, and other Mesozoic ganoid fishes.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Paleon.) An old name for a fossil consisting of the petrified teeth and palatal bones of fishes belonging to the family of Pycnodonts (thick teeth), whose remains occur in the oölite and chalk formations; toadstone; -- so named from a notion that it was originally formed in the head of a toad.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun paleontology, obsolete A fossil consisting of the petrified teeth and palatal bones of fishes belonging to the family of Pycnodonts, whose remains occur in the oolite and chalk formations.