From Dragon Ball Encyclopedia, the ''Dragon Ball'' wiki
Planet Rito (リット 惑星, Ritto Wakusei; FUNimation "Planet Litt", Viz "Planet Lilliput") is a planet in the Northern Galaxy.
Planet Rito was the homeworld of the Rittains. Vegeta attacked Planet Rito during his search for Son Goku. The native race that lived on the planet was very small, and worked for Freeza. Vegeta wiped the race out.