Ala Village Market, Guandu District, Kunming City, Yunnan Province. Kunming bullfrog wholesale in Ala Village, Guandu District, Kunming City, Yunnan Province. Bullfrog is an alien invasive species. They are large swamp frogs from North America, so they are called bullfrogs because they sound like cows. Bullfrog, the American frog, is adopted in China, so it is also called vegetable frog, and the local frog is called frog.