A bullfrog is an 8-letter large amphibian that is found in many parts of the world. It is a member of the family Ranidae and is known for its loud croaking sound. The giant salamander is a 15-letter large amphibian that is native to East Asia. It is the largest amphibian in the world, reaching lengths of up to 1.8 meters. It is a member of the family Cryptobranchidae and is known for its long lifespan and ability to survive in both aquatic and terrestrial environments.