The American Bullfrog ( Rana catesbeiana ) is an aquatic frog . It is a member of the family Ranidae , or `` true frogs '' , native to much of North America . The American Bullfrog ( Rana catesbeiana ) ) , often simply known as the Bullfrog in Canada and the United States , is an aquatic frog , a member of the family Ranidae , or â true frogsâ , native to much of North America .