Dark Spiked Goomba
From the Super Mario Wiki
Dark Spiked Goombas are Dark Goombas that have spikes on their heads. They look exactly like the shadow of a Spiked Goomba. They have 10 HP and 4 Attack. They are only found in the Flopside Pit of 100 Trials in Super Paper Mario and are found on rooms 5, 18, and 48. They attack by walking into the player, or letting the player jump into their spikes. They also poke and damage the player when lifted with the Pixl Thoreau, as do all other spiked enemies.