Grouchy Pig

Grouchy Pigs are Pigs that appear in the Angry Birds Friends Holiday Oink tournament. A pig would transform into a Grouchy Pig if the Christmas hat the pig was wearing was destroyed.

Description
Grouchy Pig 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.