bull frog

bullfrog

[bool-frog, -frawg]
noun
a large frog, especially the North American Rana catesbeiana, having a deep voice.

Origin:
1690–1700, Americanism; bull1 + frog1; so called from its size and voice

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World English Dictionary
bullfrog (ˈbʊlˌfrɒɡ)
 
n
any of various large frogs, such as Rana catesbeiana (American bullfrog), having a loud deep croak

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