Fronks are small creatures from the WarioWare series . They appear in many colors besides the most common color, yellow. The name Fronk presumably refers to both the species and the character, 9-Volt's pet Fronk. In his first appearance in WarioWare, Inc.: Mega Microgame$!, he goes by the name of Shag in the English version, which is derived from his Japanese name Shaggy. Since WarioWare: Twisted!, however, he has been known as Fronk in English, due to the word "shag" doubling as a vulgar slang term for sex in British English.
They appear in various microgames in every installment of the series. In WarioWare: Twisted!, Fronk has his own Fronk-themed microgames that are shorter than the other games, but they appear randomly in any of the stages instead of Fronk having his own stage.