Blarggwich

A Blarggwich, originally known as a Support Ghost, is a monochrome, Flatbed Ferry-topped Blargg that first appeared in Super Mario World 2: Yoshi's Island.

Super Mario World 2: Yoshi's Island / Yoshi's Island: Super Mario Advance 3
Support Ghosts are rare, appearing only in Sluggy The Unshaven's Fort in their debut game. A Yoshi can jump onto and freely move around atop the Flatbed Ferry carried on a Support Ghost's head. Once stepped on, it moves along a set course, occasionally stopping and stretching upward, leading the Yoshi to both traps and helpful items. A similar creature known as the liquid lift appears earlier in Salvo The Slime's Castle, and it is a water spirit that is thinner, lacks eyebrows, has smaller eyes, and moves in a gentle loop in a big room.

Yoshi's New Island
Blarggwiches reappear in Yoshi's New Island under their current name. One is featured as the main gimmick of the third world's special level, Ride the Blarggwich. Another variation between two Flatbed Ferries also appears in Count Fang's Castle. When the player ground-pounds on one, the Blarggwich turns red with angry yellow eyes and stretches. Blarggwiches with yellow Flatbed Ferries are stationary, while those with red Flatbed Ferries are found on a track.

Super Smash Bros. series
Blarggwiches return in Super Smash Bros. Brawl, Super Smash Bros. for Nintendo 3DS and Super Smash Bros. Ultimate, where they appear in the stage Yoshi's Island. This type perpetually acts as an extra platform over a deep pit, and players can jump onto it to avoid falling. However, it appears only at random moments.

Super Mario World 2: Yoshi's Island

 * Official Nintendo Player's Guide: Another spiritual mentor who has taken up residence in Sluggy's Fort, the Support Ghost provides solid footing for Yoshi.