During the course of Sonic Adventure, Froggy swallows both a part of Chaos and a Chaos Emerald. Abducted by E-102 Gamma, Froggy was taken to the Egg Carrier as Doctor Eggman wanted the Emerald and Chaos piece inside him. Big pursued him, and recovered his friend. However, the Chaos Emerald and the part of Chaos he had swallowed were absorbed into Chaos, allowing it to become Chaos 6, but was eventually rescued by Big with the aid of Sonic. Big and Froggy then took the Tornado 2 back to Mystic Ruins.
In Sonic Heroes, Froggy and Chocola, a Chao, were abducted. Big, Amy and Cream went to look for them under the impression that Sonic had taken them. During the adventure they instead figured out that Eggman had kidnapped Froggy and Chocola, and defeated him. However, it turned out that Metal Sonic had framed Eggman, and had kidnapped Froggy and the Chao in order to copy the residual data of Chaos. Froggy was not seen in the final scenes of the game, but it can be assumed that he and Big went back to Mystic Ruins.
Sonic Chronicles: The Dark Brotherhood
Froggy appears in Sonic Chronicles: The Dark Brotherhood in Big's POW moves Froggy Rain and Froggy Poison. In an somewhat humorous optional mission, it is revealed that Froggy has a friend who is also a frog named Norton the Frog. Froggy hadn't seen Norton in a while and was concerned about him. In the process of trying to find Norton, the team comes across his other friends, Gally, Mr. Billywick, and Mrs. Stevens, who appear to have very active social lives, according to Big's dialogue.
In the Nintendo DS of Sonic Colors, Froggy ran off on his own once more and supposedly made his way to Aquarium Park in Dr. Eggman's Incredible Interstellar Amusement Park. In his search for Froggy, Big followed him to Aquarium Park, where he began looking for him. There, Big met Sonic and Tails and got Sonic to look for Froggy, but he returned empty-handed. Sonic, however, suggested that Froggy might already have gone home by then.
Other Game Appearances
Sonic & SEGA All-Stars Racing
In Sonic & SEGA All-Stars Racing, Froggy returns as Big's All-Star Move. After Froggy hopped on Big's head, he suddenly turns into Giant Froggy. Big's all-star theme is and...Fish Hits! from Sonic Adventure.
Mario & Sonic at the London 2012 Olympic Games
In the Nintendo 3DS version of Mario & Sonic at the London 2012 Olympic Games, Big is seen looking for Froggy in Stonehenge in story mode, and after Magikoopa is defeated in the BMX event, Big finds Froggy on the ground.
Appearances in Other Media
Froggy appears in the Sonic the Hedgehog comic book series and its spin-offs published by Archie Comics. In this media, Froggy is a Mobini frog and the best friend of Big from Pais Misterioso. When Froggy drank a little of the water from Chaos, he was captured by Dr. Eggman and used to restore Chaos, but was rescued by Big. Froggy has since accompanied Big on many of his adventures with the Knothole Freedom Fighters.
Froggy also made an appearance in the Sonic X anime series. In this media, like in the games, Froggy is a frog and the best friend of Big. Originally, Froggy lived on a parallel Earth in an alternate dimension, but was send to Earth due to Chaos Control. While living there, Froggy accidently drank some of Chaos and was captured by Dr. Eggman, but was freed with the help of Sonic and his friends. Eventually though, Froggy and the others people from his dimension was returned to their home world.
- An interesting suggestion is that Froggy originates from Frog Forest, a level in Sonic Heroes, which has giant frogs that can summon forth rain and bear a very strong resemblance to Froggy. If the player stands around in Frog Forest for some time as Team Rose, Big himself also presents this theory.
- Froggy is only one of four minor characters to have his own toy, the others being standard Chao, Cheese the Chao and Kiki.
- Froggy has had both orange stripes and dark green stripes on his body. It seems he has green stripes in art and orange stripes in-game.
- In Sonic & SEGA All-Stars Racing, Froggy is shown to posses Chaos' tail.