Dry Bones Stack
From the Super Mario Wiki
Dry Bones Stacks are a type of enemy appearing in Paper Mario: Color Splash. A stack of Dry Bones forms when multiple Dry Bones group up, forming a stack. They only appear as 5-Stacks, and their health is represented by the number of Dry Bones left in the stack. Dry Bones Stacks appear in the parallel worlds on Lighthouse Island and Fortune Island.