I know this is an old post, but if you're still around, this might be a story I've been looking for too. I don't remember the gizzard detail, but by any chance was the duck going to "the king" to get it's "money back?"
I remember that being a recurring rhyme when each character was introduced. Something like "Quack, quack quack, I'm going to the king to get my money back." Then, during the final confrontation he was like, "Quack, quac, quack! I want my money back!"