bull frog


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

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

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

Collins English Dictionary - Complete & Unabridged 10th Edition
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