The Elves are characters which appear in the Bump in the Night Christmas special "Twas the Night Before Bumpy". There are two male Elves and one female elf. 

They are tough ruthless Military Elves that are in charge of the Snowmen Soldiers and their sworn duty is to protect Santa's Workshop from intruders.Bumpy and Squish sneak inside wearing a snowman disguise, but are caught by the Lead Elf. Bumpy and Squish then run off, the Elf realizes that they are intruders and sends the Snowmen soldiers to pursue them.