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.
 Microgames featuring Fronks
Fronks have their own multiplayer game called Islands. In this game, two or more players take turns shooting different colored Fronks on a spinning island. This spinning island is marked with several different sections. The section the Fronk lands on determines the player's score. After five turns, the person with the most points is declared the winner.
A yellow Fronk is also featured in some of the other minigames. In Shutter, taking a photo of him gets 200 points. He appears in a Sole Man remake in Gamer, as well as a game based off of Nighttime Allergies. In Taxi, he floats by on a yellow balloon, which can be shot. Should he be taken to the shelter, the player will get 500 points. In Patchwork, the last medium puzzle is based off of him.