Octorok
Legend of Zelda
In the Legend of Zelda Octoroks were enemies near the starting screen that shoot rocks at you dealing half a heart of damage. Upon conact they deal half a heart of damage.
Adventure of Link
A Link to the Past
Link's Awakening
Ocarina of Time
Octorocks appear as aquatic enemies in Ocarina of time. For this reason they are found in nearly any place that has water. They usually lurk under the surface of the water, but when Link gets close they pop up and spit rocks at you. If Link gets too close, they will retreat back into the water. They can be defeated with the use of any long ranged weapon or by deflecting the rocks the rocks they spit, with either the Hylian or Deku shield. A larger version called Big Octo is the mini-boss of Lord Jabu Jabu's belly.
Majora's Mask
Octoroks are identical to their Ocarina of Time counterparts, periodically hopping out of the area in which they sit. They are not a hugely common enemy, but are present in nearly every location throughout the game. (Great Bay Temple, Ikana Canyon, Southern Swamp, etc.)There are also a larger variation of the Octorok that block a required path in the Swamp area, they can be killed by either taking the boat ride and crashing into them, or using projectile weapons to attack them. They will shoot rocks at Link when he is in range, which can be deflected by all shields except for the mirror shield, which will only block them. Octoroks are easily defeated by projectile weapons, and can be made into floating platforms if frozen with ice arrows.
Oracle of Seasons
Oracle of Ages
The Minish Cap
Skyward Sword
Octoroks are now land creatures and they seem to resemble their counterparts from older 2D Zelda titles. They also have some similarities to deku scrubs from previous Zelda games. Octoroks will shoot rocks towards Link, but whenever Link comes close, they will hide under patches of grass. In order to defeat an octorok, Link can deflect the rocks back by lunging his shield forward knocking the rock back towards the enemy. Link can also use the whip to pull the octorok up from underground for a short period of time, allowing him to slash away with his sword.