Gawayn

Gawayn is a comedy-action show, a cross between Lord of the Rings and Scooby-Doo. William, an eager 10-year-old page, is completely devoted to his knight, the loveable but inept Sir Roderick.The day Princess Gwendolyn is miniaturized by the evil Duke of Amaraxos who takes over the kingdom, William, the Princess and Sir Roderick set off on an epic journey to undo the terrible curse. Joining them in this quest are Elspeth, an 11-year-old apprentice sorceress and Xiao Long, a young Chinese sage-in-training. While the five heroes of this series travel to strange fantasy worlds, fight innumerable foes to find the Crystal of Gawayn that will undo the curse, each of them is at the same time on a personal journey of self-growth.

Quack Quack ( Season 2, Episode 29 )
Just as the Questers find the Great Book of Magic they fall under the spell of a rubber duck who leads them toward a cliff. Xiao Long tries his best to break the spell of the Quack Quack. Later Princess Gwendolyn use the Quack Quack on the Duke and his minion as revenge for nearly killing them.