Can someone help me find out what breed this duck is?

[Whitney LeAnn]

At first I thought it was a mallard, but it has a lil yellow top knot.

 

[sealer39]

There is a Crested Duck that has a white top knot like that. Could be one of those.

 

[Whitney LeAnn]

There is a Crested Duck that has a white top knot like that. Could be one of those.

I have some crested ducks, but this one is way different from them.

 

[Gray Farms]

Crested Mallard or Crested Rouen