Frogs are not just green, but all colors including blues, yellows, reds, purples and an amazing array of patterns. Several species of frogs, including the common wood frog, can survive weeks with as much as 65 percent of the water in their bodies frozen solid. Some frog sounds can be heard at distances up to a half-mile. Frogs and toads use their eyeballs to help them swallow, seeming to blink as they push food down their throats. Many frogs have teeth, not for chewing, but to keep their prey from escaping as they swallow.
Frogs breathe with their lungs and skin.
Frog skin secretes mucus which helps oxygen pass fro the air into their bodies. An adult of the small-est species of frog can fit on a dime. Chemicals recently isolated from the skin of a South American frog led scientists to the discovery of a pain killer more powerful than morphine.