Chicken beaks will grow back so long as they aren't cut
too short. Typically taking off a quarter or more of the beak will prevent it from growing back. Most people that
do clip beaks only clip the very.
very end of the beak. (C) in this photo is what debeaking
should be. If there's blood, you've clipped too far.
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Claws on both chickens and ducks will grow back so long as they aren't cut too short as well. If the tips of the toes were taken off, the claws won't grow back. This is how clipping of claws should be done. If you clip the claw bone, the claw won't grow back.
View attachment 2691271
Duck bills don't "grow" the same way that chicken beaks do. It looks like they clipped the hook off the bill to keep the ducks from opening wounds on each other. It won't grow back, but it doesn't look severe enough that it would impede the duck's ability to eat or drink. You just have a duck(s) with a hookless bill.