Campbell led the Terps with 10.5 sacks per game in 2020.
The Terps also secured wide receiver Marcus Fleming as a transfer from Nebraska.
He entered the transfer portal Aug. 21.
Tagovailoa transferred from Alabama in May.
The quarterback had announced his intent to leave the program in early February.
In a statement, Tomaic said he was open to returning to the Terps.
Hamilton averaged 9.5 points and 4.3 rebounds as a sophomore with the Eagles.
Pigrome played in 11 games last season, making three starts.
The Terps' frontcourt depth will be tested without the twin forwards.
Hill entered the transfer portal in February.