Pet Turtle

The Pet Turtle is a Pet summoned by using Seaweed, which is found in Ivy Chests in Underground Jungle's shrines.

Trivia

 * The turtle is in fact actually a tortoise (the former is semi-aquatic whereas the latter is completely land-based).
 * The turtle flying with a propeller might be a reference to Rainbow Dash's pet tortoise from My Little Pony: Friendship is Magic who uses a propeller to fly.