Stoonk was a male Ferengi, and an agent of the Ferengi Commerce Authority.
Stoonk was responsible for discovering an alien plot to invade Ferenginar, while investigating a businessman named Frinx who had seemingly given up the pursuit of profit. In fact, Frinx had been replaced by an alien intelligence serving as an advance planner for the invasion. Stoonk arrested the alien, and took over Frinx's waste extraction business. His success in reviving this business lead to the common expression, "What a Stoonk." (DS9 reference: Legends of the Ferengi)