It's possible you're thinking of "Jultomten" (Swedish for "Christmas Tomte"), who is similar to Santa Claus. He's a friendly and magical creature who brings gifts to well-behaved children on Christmas Eve.
There is no association with "Juul Nisse" or any connection to the e-cigarette brand Juul in Swedish Christmas traditions.
If you have any other questions about Swedish Christmas or other cultural traditions, please feel free to ask!