You could by this if you want out to make one by cutting a plastic container like a cool whip container and cut like the size of the foot cover with vet wrap or tape so the edge are covered lay the foot onto it then use vet wrap to attach it to the foot making sure to go up around the ankle so it stays on. Wrap sung but make sure circulation isn't cut off.
Sometimes if it's a slipped tendon you can get it back in the groove if it isn't swollen that is when it really gets painful if it is a slipped tendon and you get it back into the groove look on That site poultry pedia they have a hock cushion you can make that may hold then tendon in place till healed. Only other thing I can think of is taking the duckling to an avian vet for diagnosis and treatment.
If you find it's not a slipped tendon then maybe during shipment the duckling got injured. Could have even been accidentally dropped. Just really hard to know.
Sometimes if it's a slipped tendon you can get it back in the groove if it isn't swollen that is when it really gets painful if it is a slipped tendon and you get it back into the groove look on That site poultry pedia they have a hock cushion you can make that may hold then tendon in place till healed. Only other thing I can think of is taking the duckling to an avian vet for diagnosis and treatment.
If you find it's not a slipped tendon then maybe during shipment the duckling got injured. Could have even been accidentally dropped. Just really hard to know.