My brother says it translates to something along the lines of "Quack, Quack, Quack, When you combine the power of the Maneki-Neko (Good luck cat) and the power of the duck, it makes happiness for everyone, not just you."
@zsofia3 Its just an ad campaign by an insurance company named Aflac in Japan. The lyrics are pretty similiar to what you'd find in children's songs about happiness, etc.
I found the lyrics & translation for the end of the song.. the part the duck toy sings when you squeeze it. But it won't let me copy and paste them here :( If anyone can tell me how i will...