From the Super Mario Wiki
Winged Clouds appear in Super Mario World 2: Yoshi's Island, its Game Boy Advance remake, Yoshi's Island DS, and Yoshi's New Island, and are found in almost every level.
When a Yoshi hits a Winged Cloud with a Yoshi Egg, it disappears and reveals its contents or triggers an effect. Winged Clouds can contain objects such as Smiley Flowers, five Stars, Extra lifes and ! Switches, but sometimes also creates stairs or bridges or makes coins appear instead of revealing an item. There are Winged Clouds that contain even Bandits. When being hit, a Bandit pops out and chases Yoshi around to steal Baby Mario. Due to their function, they can be considered Yoshi's Island's equivalent to ? Blocks.
Winged Clouds reappear in Yoshi's Woolly World, acting the same as in previous games.
The Winged Cloud Maker is an item that can be won in Mini Battles and Bonus Challenges, and it turns every enemy on the screen into a Winged Cloud. These most often contain coins or stars, but can sometimes contain an Extra Life.
Mario hitting a Winged Cloud in the Super Mario-Kun
Winged Clouds appear in volume 14 of the Super Mario-Kun, also providing items when they are hit, such as a Super Blue Watermelon. Unlike in the games, however, Yoshi does not need to hit them with an egg to make them spawn items.
Names in other languages
||Small Winged Cloud
- ^ https://www.youtube.com/watch?v=caS_eSIKIj0