Is there something wrong with him?

[quackkquack_]

Amazon or Etsy has them. Avian Fashions (my fave, but pricey) has them, too.

Is there a size you'd recommend for call ducks?

 

[quackkquack_]

Is that maybe just his drake noises? I only have females, but this sounds how drakes are described - raspy.

The only issue I can see is angel wing, and that's not that big of a deal and can be dealt with pretty easily. Both of my Calls had angel wing, and I cut the ankle part off a small sock, got the wing into the correct position, and put the sock around them like a little seater. I left it on for 24 hours and checked it. If it wasn't corrected, Id leave it again for another 24 hours.

Yeah I thought it was his drake noises too but it sounds a bit weird, maybe its just his vocals then.
I did try to wrap his wing with a sock before and it didn't turn out very well, the first sock he got off and the second sock for some reason he started throwing up but nothing coming out, just him opening his mouth constantly and extending his neck and head. Not sure what that was about, maybe too tight.