Definition of the word frog

The origin of the word "frog" is believed to have come from Old English "frogga" or "frocca," which was derived from the Proto-Germanic word "*frokiz," likely imitative of the animal's sound. This Proto-Germanic word is thought to have been influenced by the Proto-Indo-European root "*bhergh-," which meant "to swell" or "to project," possibly referring to the frog's prominent eyes or bulging eyes. The Old English word "frogga" was later modified to "frogh" in Middle English (circa 1100-1500 AD) and ultimately became the modern English word "frog." The word has been used to refer to these amphibians since at least the 12th century.