Yes, they can be. Kids are often fascinated by things that are a bit spooky yet still within a familiar and friendly world like the Smurfs. The idea of a ghost story set in Smurfy Hollow adds an element of mystery and adventure to the Smurf universe they already love.
It depends on the kid. Many kids enjoy the thrill of a good ghost story, and when it's set in the Smurfy Hollow, it has an added charm. They get to see their favorite little blue characters in a different light. But there are also kids who prefer the more light - hearted, non - spooky Smurf tales and might not be as interested in the ghost stories.