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Synonyms

bullfrog

American  
[bool-frog, -frawg] / ˈbʊlˌfrɒg, -ˌfrɔg /

noun

  1. a large frog, especially the North American Rana catesbeiana, having a deep voice.

bullfrog British  
/ ˈbʊlˌfrɒɡ /

noun

  1. any of various large frogs, such as Rana catesbeiana ( American bullfrog ), having a loud deep croak

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of bullfrog

1690–1700, bull 1 + frog 1; so called from its size and voice

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

To further test the theory that Bd-Brazil spread internationally through bullfrog exports, researchers analyzed historical trade records, fungal genetics from Brazilian frog farms, and genetic data from bullfrogs sold in foreign markets.

From Science Daily • Jan. 19, 2026

The first season, titled “Cabin in the Woods,” followed a mouse, a raccoon and a bullfrog.

From Los Angeles Times • Oct. 27, 2025

"I sing like a bullfrog," he once told record producer Fred Foster.

From BBC • Sep. 30, 2024

Never mind that when she sang and danced, she sounded like a bullfrog on steroids and moved like a drunken stevedore.

From New York Times • Apr. 24, 2023

It was so quiet that Winnie almost jumped when the bullfrog spoke again.

From "Tuck Everlasting" by Natalie Babbit

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.