They might do, depends how many chickens you have and how placid they are? Never introduce 1 duck on its own its cruel to expect a duck to live without other ducks for company. Obviously it will need a pond of some description and chickens can drown in water more than 8 inches deep (this happened to one of my chickens).
To be honest ducks poop a lot and dabble a lot, they make mud out of everything, I kept chickens and ducks together for 2 years and they wrecked the chicken pen, I sold them last summer and still the pen is still mud. I would advise keeping ducks and chickens separate.