From the Super Mario Wiki
The Mini Shy Guys are Shy Guy toys appearing in Mario vs. Donkey Kong, Mario vs. Donkey Kong 2: March of the Minis, Mario vs. Donkey Kong: Mini-Land Mayhem, Mario and Donkey Kong: Minis on the Move and will appear in Mario vs. Donkey Kong: Tipping Stars.
Mini Shy Guys from three games.
Mini Shy Guys will move from left to right as their main form of attack; however, if a Mini Mario or Mario himself touches them, the character will be defeated. Mario can pick them up and throw them as weapons (a.k.a. Super Mario Bros. 2), and he he can also ride them.
It is unknown if the Mario Toy Company created these toys, but most likely they did not (as they appear to be foes of Mario). They have windup corks behind them, though. It is also unknown if they are even to be thought of as different then normal Shy Guys, as manuals refer to them simply as "Shy Guys".
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