He was 11 of 21 for 175 yards in the 23-10 victory against the New York Giants in the preseason opener, a game McCarron sat out. When McCarron returned to practice a few days after the Giants game, he returned to taking second-team reps.
McCarron was 11 of 15 for 97 yards in Tampa and led the Bengals on their only touchdown drive of the night.
Pole (Washington State) and Dargan (Oregon) were undrafted college free agents who saw limited action in the first two preseason games.
The moves leave the Bengals with 87 players on the roster. The team must cut down to 75 by next Tuesday. The deadline for the final 53-man roster is 6 p.m. Saturday, Sept. 5.