Mori Dako

The Forest Daco (森ダコ Mori Dako) or Forest Octopus was a creature developed by Dr. Indigo for Shiki's plot to use monstrous creatures to attack East Blue to force the World Government to submit to him.

A tyrant of the forest, this horrible octopus-like creature comes kicking through trees. Using it's countless legs it is sure to catch it's targeted prey.

The Forest Daco was first seen in One Piece Film: Strong World. It quickly disposed of a Land Gator that was casing Luffy. It then decided to target Luffy but was soon defeated by Don Kamakiriri.

Trivia

 * The name Daco comes from a play on the Japanese words "tako (蛸)," which means octopus.
 * Even though the number of legs is described as countless, the actual number is 20.