The Ducks are ducks from Bubble Guppies (Not to be confused with the Bubble Duckies from the episode with this name). They only appear in "Ducks in a Row!". They love to join in the marching band and listen to Nonny. Also, they seem to have a habit of standing in people's way, as long as they're not marching.
The Ducks have only appeared in one episode of Bubble Guppies: "Ducks in a Row!"
The Ducks are white with orange beaks and fish-like tails. Unlike normal ducks, they have no feet.