Bullfrog Bullfrog Bullfrogs are our largest frog. They are found in quiet coves of lakes with lots of vegetation, especially water lilies. Their booming bass call is heard from mid-June to July, although last year's tadpoles may emerge a month or two earlier.
Males move out from shore and settle among the water lilies to call females.
Spawning takes place soon after the females are grasped by males. She extrudes her eggs in a huge, film-like mass on the surface among the water lilies. Bullfrogs produce as many as 20,000 eggs each year. Tadpoles hibernate in the deep silt of the lake bottom. The Bullfrog season is short.