It is a fact that drake feather are not always a clear indication of gender. And drakes have a raspy-bark like quack to them, there are some videos on YouTube that might help.
Hope that clears everything up!
Awesome flock!
In my option (I know basically nothing about runners so... grain of salt) I think that's a runner?
Also, something you should keep in mind, crests are a genetic mutation; and there isn't any skull under the crest, so it's feather and skin protecting their brain. Cute, but next...
I have heard of this condition before. In this case, I suggest checking his/her nose; ducks need to clean them in water, and I think this may be the problem. If it is, show the duck where the water is by dipping their beak in, and hopefully they'll recover.
I don't have ducks (yet!)- however I do know a thing or two about them, and I know that around spring time they probably will become SUPER territorial and might hurt themselves/will hurt you.
Just something to think about..
I think that's a Call breed- or perhaps just a Pekin. But, I could be wrong, Pekins aren't my specialty.
Also, Idk how to link my response to the text; sorry!