Parts of Belgium, that is.

St. Nicholas happens on december 6th and generally involves toys for the kids. He's the one that runs around with the black guys with bags, although the "put the naughty ones in the bag and beat 'em" part has barely survived the commercialization. Some parents still mention it, but you won't see/hear it on the street. The strongest you'll encounter is that some bags contain lumps of coal for the naughty ones instead of toys.

Santa is strictly known as "Father XMas". He generally does not come with any helpers and there is no link back to a historical person.

To complicate things further, we also have pockets where St. Martinus is celebrated. His role is similar to St. Nicholas and the name day falls on Nov. 11. Commercialization has largely missed this one, but the brouhaha surrounding St. Nicholas has been pushed so far ahead of Dec. 6th that it is being wiped out.