No, Newfoundlands do not bark a lot. Newfoundlands tend to bark only if they are bored or are feeling extra protective of a family member.
Instead of barking, a lot of Newfoundlands give their owners social cues. These dogs will get next to you and stomp their feet, or put their paws on you when they want to go out or be fed.
Some owners of Newfoundlands say their puppies bark a lot, but if you train your Newfoundland puppy from an early age, they won’t bark much when they are more mature.