Scrap

Scrap (スクラップ) is the remains of broken, inactive machines that appeared as obstacles in some games from the Mega Man franchise.

Mega Man 11
Scrap, named Scrapp in the game's Gallery, is the remains of unfortunate robots who tumbled into the chemical pipes from Acid Man's stage. All they can do now is be dragged along by the acid stream, causing some damage on contact. The scrap that appears are Metalls, Shield Attacker Ms, Droppies and Pipettos. Active Droppies will destroy scrap on contact to keep the pipes clean.

Mega Man X series
Scrap is the head from a broken Utuboros that appears alongside Scrap Robos in the conveyor belts from Flame Mammoth's stage in Mega Man X, the remake Mega Man Maverick Hunter X, and Mega Man Xtreme 2.

They are generally harmless and X (or Vile and Zero, depending of the game) can even stand on them, but they will cause some damage if they fall on top of X due to their weight. They will simply be carried by the conveyor belts until they fall into the molten metal in the end and get melted. After Chill Penguin's defeat in Mega Man X, the molten metal will cool down and the Utuboros heads will break into pieces when they fall from the conveyor belt.