Who made the duck song?

You're likely referring to the song "The Wheels on the Bus" which includes the line "The ducks go quack, quack, quack." This song is a traditional children's song with no single known composer.

It's a folk song, meaning it has been passed down through generations with variations in lyrics and melodies. There are many versions of "The Wheels on the Bus" with different verses, and its origins are uncertain.

However, the earliest known printed version dates back to the 1930s. So while no single person can be credited with creating it, it's a beloved song that has entertained children for decades.