From the Super Mario Wiki
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A Cloud Block is a semisolid block mainly used as platforms for bonus areas above the ground. They first appeared in Super Mario Bros. in World 2-1, in the bonus area accessed by hitting the secret beanstalk halfway in the level. Cloud Blocks have the same appearance as Lakitu's Cloud, though it is slightly smaller.
Super Mario Bros.
Super Mario Bros. 3
In Super Mario Bros. 3, Cloud Blocks first appear in the sky in World 1-1, reached by flying to the top of the level with a Super Leaf. From this game onwards, Mario can pass through them from the bottom.
Giant versions of Cloud Blocks also appear in World 4.
Super Mario World
Super Mario Maker / Super Mario Maker for Nintendo 3DS
In Super Mario Maker and Super Mario Maker for Nintendo 3DS, Cloud Blocks have a new design for the New Super Mario Bros. U game style. Cloud Blocks can be destroyed by Thwomps, Bowser in Super Mario Bros. 3-styled levels, and Skewers.
Super Mario Run
Super Mario Maker 2
Names in other languages