Nokken is an enemy in Four Swords. Multiple Links will need to work together to defeat a Nokkun. After Link strikes a Nokkun, it will curl up into a ball on the ground, similar to a Hikkun and a Rollobite. Its hard shell makes it invulnerable in this state. Instead, one the Links must pickup the enemy and toss it towards another Link. While being toss, the Nokkun will open its hard shell and will glide back down to the ground. This will make it vulnerable to attacks in which the second Link can slash away.
Nokkun from Four Swords.