That's very cool! Imprinting doesn't happen to often as far as I know but when ducklings do I think it's for their lifetime, I'm not 100% sure as I've never had one of my ducklings imprint.
Yep duck smooches love them. lol I am not sure if Opie thinks he is a duck well he hangs out with his females outside but when he is in the house he has his own bed and might think he's one of the dogs since he hung out with them when younger. Never heard him bark though.Duck Smooches