[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

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Example sentences
The amphibians in the golf course ponds also only thrived there if no bullfrog
  tadpoles were present.
He likes the way eyes can play tricks--show a giant bullfrog can turn out to be
  a cedar tree or a traffic sign.
It was really tough to put the bullfrog stew into my mouth.
All waters of the state are open to bullfrog hunting except waters within state
  and federal wildlife refuges.
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