Brooks earned second team All-Big Ten honors in 2019.
McFarland rushed for 1,636 yards and 12 touchdowns during his two seasons in College Park.
The Washington Redskins selected Young with the No. 2 pick in the NFL draft.
Four Terps could be taken in the draft's late rounds.
The Gaithersburg native becomes the Terps' highest-rated class of 2021 recruit.
"My routine doesn't change. I still wake up early, get out there, and go through the necessary steps."
Robinson served as the Terps' cornerbacks coach and defensive passing game coordinator.
The Terps are left with Josh Jackson and Lance LeGendre as their lone scholarship quarterbacks.
Defensive back Osita Smith, offensive lineman Amelio Moran and defensive lineman Almosse Titi all signed Wednesday.
Pigrome played in 11 games last season, making three starts.