The Coqui frog in Puerto Rico is the world's loudest frog. If you are close to it, make sure to wear ear plugs. The sound it produces is as loud as a jack hammer.
Calaveras County (California, USA) is home to the yearly frog long jump competition. The longest jumping frog receives a $5000 prize as well as a plaque in the Frog Hop of Fame.
Historically, people in Europe used frogs to predict rain or bad weather. The European Tree Frog is an example of a primitive living barometer. The frog starts croaking when the air pressure changes.
The american bull frog makes three distinct calls, one of them is used to indicate a fight is about to start.