Grouchy Pig

Holiday Oink is a Pig that appears in the Angry Birds Friends Holiday Oink tournament.A pig would transform into Holiday Oink if the Christmas hat the pig was wearing was destroyed.

Description
Holiday Oink is a fluffy pig that has big bushy eyebrows and yellow eyes with a green iris and black pupils. It has a grumpy expression.

It's most likely a parody of the Grinch, a human-like monster that hates Christmas. He is a character from one of the stories made by Dr. Seuss.