Dinolfos, called Dynalfos (ダイナフォス Dainafosu) in the Japanese versions and in The Legend of Zelda: Twilight Princess, are a species of lizard-like warriors originally found in The Legend of Zelda: Ocarina of Time that can be considered a mini boss of Ganon's Tower. In the stage, you'll find a group of two of them near the end of the game. They're similar in appearance and tactics to Lizalfos, though they're much stronger and harder to defeat. After you defeat the two of them, they can defeat another group in the Gerudo Training Ground. It has been speculated that the Dynalfos from The Legend of Zelda: Twilight Princess may be the same creature.
Dinolfos also appear in The Legend of Zelda: Majora's Mask, in which they would appear in Snowhead Temple, Ikana Canyon, and the Moon. In this game they were weaker, though wielded different weapons and armor.