Pikzo is a caveman artist that has not spoken a word since his child was eaten by Yumyum. He has painted on his wall a guide to Yumyum's maze.
Tink
Tink gives you your first real weapon in the game. (heh.. yea.. no yoyo in this game..) He gives it to you for free because: "Cavemen don't have money. We just have thank-you!"
Pikazo, the caveman artist, was meant to sound like Picasso, the real-life artist.