The Eyeball Frog is an item exclusive to Ocarina of Time. A frog with unusually large eyes, it is not only used to make the World's Finest Eye Drops but is also considered a delicacy. It has a limited time frame for use, however, as it must be kept cold once taken out of it's natural habitat to keep it from spoiling.
 The Legend of Zelda: Ocarina of Time
Part of the quest for the Biggoron's Sword, the Eyeball Frog is a quest item given to Link by King Zora XVI of the Zora in Zora's Domain. Link must then take it to the Lakeside Scientist, who resides in the Lakeside Laboratory at Lake Hylia.
Like other items in the quest, Link must deliver it before the time limit for the frog to be of use. Upon Link's successful arrival, the scientist first believes it to be a gift and is excited at the prospect of eating the frog. After the confusion has been cleared up, he instead prepares and gives to Link the World's Finest Eye Drops to give to Biggoron up on the summit of Death Mountain.
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