Frog , also known as Glenn, is a fictional character in the 1995 video game Chrono Trigger. He was designed by the game's artist, Akira Toriyama. He is an anthropomorphic frog knight from the Middle Ages era who was cursed into the form by his nemesis, Magus. He was born as a human by the name Glenn and a friend of the late brave knight Cyrus. After witnessing Cyrus' death at the hands of Magus and being transformed into a frog, Frog vowed to avenge Cyrus by killing Magus. During the game, he obtains the Masamune, an ancient sword whose offensive capabilities against magic users is Magus' major weakness. Frog wields a broadsword and can also learn "Water" and, like Marle, healing magic.