[boo
l-frog, -frawg] 
| a large frog, esp. the North American Rana catesbeiana, having a deep voice. |
| bull·frog (bŏŏl'frôg', -frŏg') n. Any of several large, heavy-bodied frogs, chiefly of the genus Rana and especially R. catesbeiana, native to North America and having a characteristic deep resonant croak. |