I have a friend down in Cajun country. He says to breed a tame mallard over muscovy hens the result are called mulies. He says they are the best I haven't tried it yet but have spoken with a few Cajuns and they all have backed him up on it.
I am going to try it some day. Right now I have to eat all of the wild duck in my freezer Lots of Woodys and Mallards it was a wonderful season this year.