Its a Muscovy so no quacking. Its to young to say for sure. Post pics in couple more weeks, if it stays relatively the same size its a female. If it goes through a huge growth spurt its a male.
Muscovy duckling. Unsure of variety but could be barred? Is that the only one you have? If so I would suggest getting him/her another Muscovy friend ASAP. Chickens will not keep him happy..