Stock photography, photos: B1737 Bullfrog Stock photos of A bullfrog, Rana catesbeiana, appears to be smiling at the camera. Photograph: © Michael Gadomski Click for a larger image and more information Keywords associated with this stock photo: Bullfrog, Rana catesbeiana, amphibian, frog, green, face, funny, anthropocentric, cold, cool, cute, earthy, humor, instinct, metamorphosis, natural, smile, smiling, grin, grinning, the prince, wild, marshes, swamps, wetlands, America, Pennsylvania, United States, ecology, North America