Okay, I found this paper and thought it was really cute and could sort of pass for ducks. However, both my husband and I decided it really looked like chicks in boots.
So, while searching through stickers, I found this one, that actually is a duck. It does have the Looney Tunes branding on it, so it should be fine to use. Figuring out the way Daffy talks was more difficult.
The only actual stamp I have that is close is definitely a goose. I thought about trying to do a Duck, Duck, Goose card, but couldn't quite figure that one out.