Grogarou (lit: Big Werewolf), also known as Ptigarou, is a werewolf-like character from Les Pyjamasques picture book series.
He was the antagonist of the first book, "Les Pyjamasques et le Grogarou." The Les Pyjamasques fought him one night, when they ran onto him. Bibou eventually managed to subdue the wolf by blocking out the moon, thus restoring him back to his normal form.
After this, Grogarou became an ally of the Pyjamasques. They gave him a pair of sunglasses to prevent him from transforming again. In the third book, "Les Pyjamasques et Roméo Mécano," Yoyo took Grogarou's sunglasses off so Grogarou could transform and fight Roméo.