Control Horn's name is Conjectural. No official name has been given, and it is subject to change at any time.
Control Horn allows Cow Cowboy to mind control cows. It appears that he needs both horns intact for his Quirk to work, as when All Might chops one off, it stopped working.
He is seen controlling hundreds of them at a time as he was threatening to stampede a whole province of Japan if his demands were not met.