Watch Frog Song: The World of Amphibians for Free: How to Stream the Movie Online at 123Movies. . Amphibians are living fossils in a modern world. The various species of frogs, toads, and salamanders are more diverse than you could ever imagine. Whether dodging danger, raising their young, or wearing a disguise, amphibians never cease to amaze. So, hop along to your local pond, dive in, and explore the fascinating world of the frogs and their cousins.