Ropa

The Ropa is a bizarre tentacled creature that inhabits the Dark World of Hyrule in A Link to the Past and a few other locations in Four Swords Adventures.

A Link to the Past
In A Link to the Past they are much stronger than they look for their short size and are able to deal a surprising amount of damage. They have a light green body, and orange tendrils sprouting from their weed-like "head" that may be used as a method of attack. They have no legs or organic formations that may be used like legs, so they stalk their victims by propelling their mass through the air, hopping repeatedly to close distance. Ropa appear commonly in the Skeleton Forest and Ghostly Garden and the grounds surrounding the Palace of Darkness, but are found throughout the Dark World.

Four Swords Adventures
In Four Swords Adventures, they are less aggressive or as powerful, but appear in large groups and move erratically. They appear to contain water, which occasionally squirts out from the top of their bodies.

Trivia

 * The Ropa is likely to be the first enemy Link encounters in the Dark World, as they appear on the Pyramid of Power. They also appear in the Pyramid of Four Swords Adventures.
 * Its possible that the name Ropa is intended as a connection to a Roper, a tentacled monster that appears in the Dungeons & Dragons series.
 * As they were never officially named in the English versions of A Link to the Past, Ropa were often mistaken for Peahats.