CT Scans Reveal Frogs' Odd Dental History (IMAGE) Florida Museum of Natural History Caption Some frog species have teeth while others are toothless. Still others have a combination of true teeth and toothlike structures. The Solomon Island leaf frog, Cornufer guentheri, has true teeth on its upper jaw and bony fangs on its lower jaw, which do not have enamel or dentin, a dense tissue found in teeth. Credit Daniel Paluh/Florida Museum of Natural History Usage Restrictions Please credit Daniel Paluh/Florida Museum of Natural History. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.