American bullfrog refers to a kind of bullfrog native to the eastern United States. By 2014, they had spread to every state except North Dakota due to human factors. The American bullfrog has spread into a disaster and is flowing down the Yellowstone River in Montana in the northwest, posing a threat to native frogs.
In terms of body size, the adult American bullfrog can reach 25 cm in length and weigh more than two kilograms (the big one can exceed three kilograms). Therefore, in terms of body size, it is impossible for ordinary snakes to swallow American bullfrog directly, unless they are boa or boa constrictor. But don't forget, the American bullfrog won't stay there and let you ravage it.
American bullfrog has a very strong ability to survive in the wild. They don't eat insects like other frogs. American bullfrog mainly hunts fish in the water and some invertebrates.
Source: @dennymichaels