Norwegian Christmas horror movie... with killer 'elves'.

They look like Dwarves too me.

In the film from director Magnus Martens, “An American family fulfills their dream of returning to their roots after inheriting a remote cabin in the mountains of Norway. However, they are in for a big surprise. An elf with a nasty temper lives in the house’s barn. When the family starts to infuriate the creature, a raw and bloody struggle for survival ensues.”