Some ducks and geese have longer scaling on the edges, it’s usually to protect the delicate edges of their webs, however those do look a bit long and after viewing the pic you provided on your other post about bumblefoot I have good news and bad news.
The good news is your duck doesn’t have bumblefoot, at least not yet.
The bad news is he does have an ailment called footpad dermatitis, luckily it’s at the beginning stages so it’s easier to treat than bumblefoot and doesn’t require antibiotics. It can sometimes turn into bumblefoot if left untreated.
Footpad dermatitis “avian trenchfoot as I call it” is inflammation of the skin on the bottom of the feet that causes excessive keratin growth as a reaction. It’s caused by ammonia scalding from long term contact with dirty bedding and feces OR from being on damp bacteria ridden ground for a prolonged period of time, basically if they’re wandering around on mucky ground all winter and the feet don’t get enough opportunities to dry off and kill the bacteria it causes this.
Treatment involves pouring hydrogen peroxide on the bottoms of the feet twice a day for a week to two weeks and letting them sit somewhere clean and dry for the feet to dry off after each cleanse.
I also recommend cleaning their area and replacing their bedding or switching them to a new run or pasture to let the ground rest and dry out.
