Etymology
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bullfrog (n.)

also bull-frog, large North American species of frog, 1738, from bull (n.1) + frog (n.1). So called for its loud voice.

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Definitions of bullfrog

bullfrog (n.)
largest North American frog; highly aquatic with a deep-pitched voice;
Synonyms: Rana catesbeiana
From wordnet.princeton.edu