King Choropū

King Choropū (キングチョロプー) (translates to King Monty Mole) was a boss found in pre-release builds of Paper Mario: Sticker Star. It is a large, purple Monty Mole with a beard and a crown, and appeared to be some kind of ruler of the Monty Mole species.

Super Mario-kun
In volume 5 of Super Mario-kun, one of the Monty Moles briefly mentioned the existence of King Choropū when one Monty Mole suggested to take Mario and his friends to King Choropū's place. However, the Monty Moles changed their mind and decided to take them to their livestock instead.

Paper Mario: Sticker Star
King Choropū would have physically appeared in Paper Mario: Sticker Star, as seen in an E3 2010 screenshot. King Choropū would have likely been a boss, and one of his attacks involved him throwing a giant boulder at Mario or his partners.