Gunther's Amoy frog, Guenther's Amoy frog, Günther's frog, Guenther's frog, Günther's red-and-black frog or Gunther's brown frog ("Sylvirana guentheri") is a frog from Vietnam, China and Taiwan. People have brought this frog to Guam. It can live as high as 1100 meters above sea level.