Kuriza (クリーザ, Kurīza?) is the son of Freeza who shows up on Earth to cause some trouble in Neko Majin Z. He is brought by Onio to defeat Z, who had beaten Onio earlier. He claims him to be the "true" strongest in the universe, only to be rammed into the ground by an angry Neko Majin for having interrupted his battle with Thunderbolt, the alleged "strongest in the world." He tries to fight Z by transforming like his father. The fight is interrupted by the end of the manga. He decides to stay with Z until they can fight. He later cheers on Vegeta who came to rescue him, but Vegeta also reaches a stalemate with Z.
That's taken from a Wiki article about extraterrestrials from the DB universe.
I don't remember that happening or him ever being mentioned.
Was it in a manga or something?