From Dragon Ball Encyclopedia, the ''Dragon Ball'' wiki
The Rittains (リット星人, Ritto-seijin; FUNimation "Littain", Viz "Lilluputian"), or Ritts, are a race from Planet Rito.
The Rittains look similar to the Dodo.
Dragon Ball Z
The Rittains appeared during the Garlic Jr. Saga. They were all killed by Vegeta whilst he searched for Son Goku in space after his battle against Freeza. The Rittains did not know that Freeza had been defeated by Goku.