Toss Kong
From the Super Mario Wiki
Toss Kongs are giant Mini Donkey Kong toys that appear in Mario vs. Donkey Kong 2: March of the Minis. If a Mini-Mario touches one, the Toss Kong will throw it up in the air.
Sometimes Toss Kongs will throw Minis up onto a one-way platform, thus providing a boost for them. Other times, Minis will be thrown back and forth (up to two at a time) until help arrives, usually with a hammer. Other times, Colored Blocks can be realized when the Minis are at their highest point to escape his wrath. Toss Kongs cannot damage Minis.

