The title of this article is conjectural; an official name for the article's subject has not been found, so it has been given a fitting title by the editors. If an official name is found, then the article should be moved to its appropriate title.
Octopus was the boss of the Turtle Zone in Super Mario Land 2: 6 Golden Coins. The Octopus will attack Mario by trying to touch him; in order to defeat the Octopus, Mario had to hit it's head three times, which is difficult, as the entire battle with the Octopus takes place underwater.
Appearances in Other Media
The Octopus also appears in the Mario VS Wario comic, which is a (loose) adaptation of Super Mario Land 2: 6 Golden Coins. The Octopus attempts to attack Mario while he is crossing a lake, but is stopped when Mario asks what an octopus, a saltwater creature, is doing in a freshwater lake. The Octopus ponders this and then exclaims that that must be why it hasn't been feeling good. Mario offers to pour some salt in the water for the Octopus, but accidentally pours sugar in instead. The Octopus is last seen lying face down in the water, unmoving.