Seaweed

Seaweed summons a turtle pet that follows the player, like other pets. It lasts indefinitely and does not attack enemies nor take damage, and is purely for aesthetics. Seaweed is an uncommon item found in the Underground Jungle's Jungle Shrines.

Trivia

 * It's a possible reference to Rainbow Dash's pet tortoise Tank from the animated series My Little Pony: Friendship is Magic, who also uses helicopter-like rotors on his shell to fly.