From Zelda Wiki, the Zelda encyclopedia
The Big Octorok (大オクタロック, Dai Okutarokku) is the boss of the Temple of Droplets and guardian of the Water Element.
Though simply a typical Octorok to a normal-sized Link, when Minish-sized, this mediocre creature becomes gargantuan, worthy of the title, "Big Octorok". When encountered, it is frozen in the Temple of Droplets' central room, in close proximity to the, also frozen, Water Element. After Link flips two giant switches within the adjacent room, a hatch on the ceiling opens wide, allowing sunlight to thaw both the frozen boss and Element. Before Link can claim the element though, the Big Octorok sucks it up and retreats into the next room.
Traditionally, Link must use the Octorok's rock-spitting tendencies against it to inflict damage. New to the species but in taking full advantage of size, the Big Octorok will also try to suck Link up infrequently, as well as ram the walls, causing rocks to fall from the ceiling.
After a few hits, the Big Octorok will freeze itself and all of the water covering the floor, and the budding flower on its back will be vulnerable. Link must seize the opportunity to don the Pegasus Boots, run to the Octorok's backside, and set the flower on fire with his Lantern. Repeating this process a few times will complete the battle; Link will receive the Water Element along with another Heart Container for his efforts.
| Big Octorok (Figurine from The Minish Cap)
|| Appears in the Temple of Droplets. Frozen solid by the power of the Water Element. He's been frozen so long that his hunger is unbearable.
| Names in Other Regions
|| Large Oktorok