To obtain the Follow the Cuccos side quest in The Legend of Zelda: Tears of the Kingdom, speak with Trissa in Kakariko Village. For this quest, you’ll need to follow the two chickens all the way to a cave near the top of the mountain where you’ll discover Cucco Hideaway.
Loot all the eggs then return to Trissa. You’ll receive a purple rupee as a reward and the Follow the Cuccos side quest will complete!