Dinkins had 14 receptions for 122 yards and two touchdowns last season.
The transfer has made the switch from defensive end to defensive tackle.
Allar finished as a semifinalist for the award a season ago.
Ross and Peña are two of the three new receivers from the transfer portal.
This is the running back duo's third consecutive season on the award's preseason watch list.
Duzansky has now appeared on the Mannelly Award watch list for two consecutive seasons.