Honestly best way to tell what this is would be to catch him so you can examine and get some good pics so we can help.
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You could be right and the Duck is sufferingMy ducks eat a lot of food and don’t have anything like that hanging from them. Please explain what you mean.

You could be right and the Duck is suffering
I doubt it..

Oh, my bad, I missed that. Zoomed in and now I see it!
View attachment 1727541 View attachment 1727542
Could something be impaled in him? Remember the duck a few years ago that had the wood stuck in her?