I'd heard there was some connection with frogs in a town in Connecticut, but had never investigated until my husband and I went up there to have lunch with our son and haul back some of his dorm room stuff in anticipation of his finishing up his freshman year of college next week.
So it turns out in 1754 during the French and Indian War, some residents heard terrifying shrieking late at night and fired their muskets to ward off warring tribal people or Judgment Day, but in the morning they discovered a lot of dead bullfrogs that had all congregated in one tiny pond seeking water during a drought. It became known as the Great Windham Frog Fight and has been commemorated ever since.
There were signs and sculptures of frogs everywhere. This is one of four copper frogs that decorate the "Frog Bridge" that crosses the Willimantic River.