What is the mangkwan clan s role in the avatar series?

The Avatar franchise, encompassing "Avatar: The Last Airbender" and "The Legend of Korra," presents several prominent clans and nations, including the Fire Nation, the Northern and Southern Water Tribes, the Earth Kingdom, and the Air Nomads. No official episode, comic, or book references a clan named "mangkwan". It is possible that the term is a misspelling, a fan‑created concept, or pertains to content outside the canon of the series. If you can provide additional context, such as a different spelling or the source where you encountered the name, I can help clarify or confirm its existence.