From the Super Mario Wiki
Cracked Blocks are common breakable objects found in a few Donkey Kong Country games. Even though they gain their name in Donkey Kong Country: Tropical Freeze, small structures that function identically are also found in the predecessors, Donkey Kong Country Returns and Donkey Kong Country Returns 3D.
Most Cracked Blocks contain items like bananas, and are sometimes found in stacks, especially in Tropical Freeze. The Kongs are able to jump and stay on a Cracked Block just as on any other platform. Ground pounding on it will gradually damage the block until it gets entirely destroyed, exposing the item inside it. Three ground pounds are necessary to destroy a Cracked Block, unlike crates, which only require one.
Screaming Pillars turn into breakable structures when they drop on the ground. They also require three ground pounds to break.