Quacker is a fictional cartoon character from the Tom and Jerry cartoons. He was voiced by Red Coffey, from Quacker's first appearance in 1950 (in Little Quacker) up until 1957, though the voice has often been (erroneously) credited to Clarence Nash (who was better known as the voice of Donald Duck). He usually loses his mother and needs Jerry to thwart Tom's plans to eat him.
Quacker appears in Tom and Jerry in War of the Whiskers as Duckling. He is believed to be a predecessor to the later Hanna-Barbera character Yakky Doodle. He certainly appered in Looney Tunes: Back in Action.