say it: BUUL-frawg
bullfrog is a noun meaning "largest North American frog; highly aquatic with a deep-pitched voice". It carries one recorded sense.
largest North American frog; highly aquatic with a deep-pitched voice
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for bullfrog come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.