bull·frog

[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) [Click for IPA pronunciation guide]
 
n
any of various large frogs, such as Rana catesbeiana (American bullfrog), having a loud deep croak

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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00:10
Bullfrog is always a great word to know.
So is gobo. Does it mean:
a fool or simpleton; ninny.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
Example sentences
It was really tough to put the bullfrog stew into my mouth.
After locating a bullfrog, slowly work your way toward it while your partner
  keeps the flashlight trained on its eyes.
He likes the way eyes can play tricks--show a giant bullfrog can turn out to be
  a cedar tree or a traffic sign.
All waters of the state are open to bullfrog hunting except waters within state
  and federal wildlife refuges.
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