Petal Guy

Petal Guys (originally known as Mufti Guys ) are a type of Shy Guy that wear flowers on their head to disguise themselves. Their petals can come in different colors.

Super Mario World 2: Yoshi's Island
Mufti Guys first appear in Super Mario World 2: Yoshi's Island. They use flowers to hide by crouching down on the ground so that Yoshi can only see the flowers. When Yoshi gets too close to where they are hiding, they will get up and try to hurt Yoshi. When they get up, they still have flowers on their head.

Yoshi's Island DS
In Yoshi's Island DS, Petal Guys disguise themselves as flower patches and begin to start moving when Yoshi comes close to their hiding spots, similarly to Super Mario World 2: Yoshi's Island.

Yoshi's New Island
Petal Guys return in Yoshi's New Island, acting the same way as they did in previous games. While green-robed variants have artwork, they are absent, as only the regular red-robed ones make an appearance in-game. They hide as a flower bed, and get up to move around when Yoshi approaches them.

Mario Party Advance
A Petal Guy appears in Mario Party Advance. One of the player's quests involves helping him tell a Flutter that he is in love with her.

Yoshi's Crafted World
In Yoshi's Crafted World, Petal Guys wear flowers made of cardboard instead of actual ones. Only green-robed Petal Guys appear. They can be defeated with Yoshi's jump, but their flowers protect them from all attacks until they reveal themselves.

Super Mario World 2: Yoshi's Island

 * Official Nintendo Player's Guide: Clever camouflage, eh? You'll have to jump or pound them twice to knock the flowers off.