King Tuffle was a Tuffle seen and mentioned in a flashback that Baby tells during Dragon Ball GT.
History
Although King Tuffle was only seen in Dragon Ball GT, chronologically, he would have existed before the start of Dragon Ball. King Tuffle was the last Tuffle king to exist, and apparently used an advanced machine to combine his body and DNA with the genetic experiment known as "Baby" in order to exact vengeance for his people. Prior to his people's final eradication by the Saiyans near the end of the Saiyan-Tuffle war, Baby was launched into space to escape the planet's destruction, the remnants of the Tuffle King along with him.