From the Super Mario Wiki
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Crash Kongs are tiny enemy toys in Mario vs. Donkey Kong 2: March of the Minis that carry cymbals. When this Kong sees a Mini Mario, the Crash Kong will try to ram the Mini Mario into a wall to crush them.
Crash Kongs walk around, back and forth, on a surface, at a same pace, stopping at an edge each time. If it sees a Mini Mario, it will run faster after an exclamation point flashes over their heads. Mini Marios can actually jump upon a Crash Kong - this becomes a stepping stone that helps get into pipes and sometimes provides them with a way across a section of spikes.