Wintergreen is a parody of Wolverine. He is the leader of the Elfa Strike Squad. They share a similar haircut, tough-guy
attitude, gruff voice, and powers. While Wolverine has adamantium claws and bones, Wintergreen's are made of peppermintium, giving him claws that resemble candy canes. Wintergreen and his team were tricked into fighting Sector V for the Reindeer System, who had been framed by the Delightful Children until he realized it was a secret surprise reindeer Rainbow Monkey because they found out that Sector V wasn't at the North Pole after all. Numbuh 5 explains they were at the store all day waiting in line to buy the Rainbow Monkey doll. The Nutcracker then wonders if Sector V didn't do it, then who had the reindeer, realizing they were innocent, they had help Sector V clear their name.
Incidentally, Wintergreen is often seen sucking on a candy cane when off-duty (a parody of Wolverine smoking cigars). While he refuses to be the stereotypical, jolly, toy-making elf, he cares deeply about Christmas and will defend it with his life. He is almost invincible, because in his debut he took 50+sleeping darts, likely due to his regenerative powers. He is voiced by Dave Wittenburg.