This image has been circling the internet of a man supposedly with a 13 pound frog but is it real? No. American Bullfrogs don’t even reach a foot long and weight only a pound and a half tops. The dude is holding the frog out far so it appears bigger in the picture. It’s still probably a large frog but not close to 13 pounds. The Goliath Frog is the largest frog in the world and it only grows to slightly over a foot and weights up to 7 pounds.