Triton

Triton was a moon that orbited the planet Neptune, the eighth planet of the sol system. It was originally a rogue planet until it was caught in Neptune's orbit.

Triton was a cold moon with a thin nitrogen atmosphere. It had frozen pink poles, volcanoes of ice and solid lakes. It was inhabited by the Waro. (PROSE: The Devil Goblins from Neptune)

By the 38th century, Triton was inhabited by humans. (TV: Sleep No More)

The space pirate Baltazar was referred to as the "Corsair — King of Triton in the 40th century". (TV: The Infinite Quest)