From Dragon Ball Encyclopedia, the ''Dragon Ball'' wiki
Zoonama (ズーナマ, Zūnama; FUNimation "Zoonama") is a giant monster who lives in an underground cave near a volcano on Planet Gelbo.
His name comes from the Japanese word namazu, or catfish in English.
Zoonama terrorized the people of a small village by telling them that if they did not do as he commanded, he would create earthquakes. When he requested a bride to marry, Trunks Brief substituted for Lene and dressed up as a woman. He then went with Zoonama, but was secretly followed by Son Goku, Pan, and Domas (Lene's fiance). In the end, they found out that Zoonama could predict earthquakes and volcanic eruptions thanks to the movements of his mustaches, but was not able to actually create them.
 Video games
Zoonama appeared in Dragon Ball GT: Transformation.