Control Horn's name is Conjectural. No official name has been given, and it is subject to change at any time.
Control Horn allows the user to mind control cows.
Cow Cowboy 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.
It appears that Cow Cowboy needs both horns intact for his Quirk to work, as when All Might chops one off, it stopped working.
- My Hero Academia: Vigilantes Manga: Chapter 6+ Beta.