Nep-Enut

Nep-Enut, also known as Nep-enut , Super Big Nep-Enut , Super Big Nep-enut , or Giant Nep-Enut  , is a water-based, blue counterpart to Gargantua Blargg that hides underwater in Super Mario World 2: Yoshi's Island, Yoshi's Island: Super Mario Advance 3, Yoshi's Island DS, Yoshi's New Island, Yoshi's Woolly World, Poochy & Yoshi's Woolly World and Yoshi's Crafted World. Nep-Enuts remain submerged until Yoshi approaches it. It then rises, blocking Yoshi's path. Yoshi must throw a egg for it to submerge in the water (and only its eyebrows remain visible). If Yoshi jumps over it, it chases.

A particular Nep-Enut in the Super Mario World 2: Yoshi's Island level What's Gusty Taste Like? lives in a secret underground area, and is located entirely underneath terrain and Semisolid Platforms, making it untouchable when it is not in its risen form. The Player's Guide specifies this one as a Submarine Nep-Enut, though the actual behavior between the two is the same.

In Yoshi's New Island, two Nep-Enuts appear in Rise of the Nasty Nep-Enuts, one in the first area and the second in the last area. Both of them chase after Yoshi. They take three eggs to cause them to temporarily retract into the water rather than one.

In Yoshi's Woolly World and Poochy & Yoshi's Woolly World, Nep-Enuts appear only in the course, Frozen Solid and Chilled. By tossing three yarn balls into them, Yoshi is able to stun the Nep-Enuts for a few moments. They spit out Shy Guys at Yoshi. Nep-Enuts can be instantly frozen with an ice watermelon. They can be climbed on during their frozen state, but release themselves from the ice after a short while. However, Nep-Enuts can be defeated permanently if Yoshi pounds them while they are frozen.

At least one Nep-Enut was originally going to appear in Paper Mario, but was removed from the game for unknown reasons.

Trivia

 * The Super Mario World 2: Yoshi's Island box art and game cover shows Yoshi about to cross a gap with a Nep-Enut in the background.
 * Nep-Enut is an anagram of "Neptune", the Roman god of the sea.
 * It is possible to go inside a Nep-Enut in Yoshi's Woolly World and Poochy & Yoshi's Woolly World, because of invincibility frames. Yoshi can stay inside the Nep-Enut if there is a platform underneath it, but will lose health when it moves its mouth to spit out Shy Guys.