Kaeru-kun is a small frog character associated with the Sonic the Hedgehog series, most notably appearing as a recurring companion and plot element in the broader Sonic universe. The character is best known for being Froggy’s Japanese name in some contexts, and is often linked to Big the Cat’s storyline. Kaeru-kun serves as a cute, non-combatant creature whose presence helps drive side quests, collection goals, and lighthearted moments rather than major battles.