Grog

Grog is a character who first appears in Ocarina of Time, where he can be found in Kakariko Village when Link is a child. He sits underneath the tree near the village entrance at night. He is Mutoh's son, Anju's brother and a bit grumpy (or perhaps angsty, given his punk rock look). He appears to have some kind of relationship with the potion shop lady.

Ocarina of Time
As a child, Grog can be found sitting under the tree near the entrance to Kokiriko Village.

Later when Link is an adult, as part of the Biggoron Sword sidequest, after hatching the Pocket Cucco and awakening Talon in Kokiriko Village, Anju will give Link Cojiro, whom she said was her brothers cucco and would only crow for him. Link will find Grog in the Lost Woods sitting beside a tree stump and show him the cucco, he will give him an Odd Mushroom which Link must give the old hag who owns the medicine shop in Kokiriko. She in turn will give him an Odd Potion to give to Grog. Although when Link returns to the forest to give Grog the medicine, Fado is there. She explains that due to the fabled curse of the woods, Grog is gone and has become a Stalfos.

Majora's Mask
In Majora's Mask he has a completely different role, and now has a Mohawk hairstyle instead of his previous bald look. He is the owner of the Cucco shack and loves his chicks, but when he hears the rumor that the moon will fall on Termina in three days, he is filled with sorrow as he understands he won't see his chicks develop into chickens. By playing the Bremen Mask song, you can help him to see his chicks grow up.

Trivia

 * In common day usage, grog is slang for an alcoholic drink, originally composed rum and water, known for being a popular beverage among pirates.