Jo Kuffour put the Pirates ahead with a overhead kick two minutes after the break, and Trollope's side missed chances to extend their lead before Anthony Pilkington curled home a superb equaliser after 70 minutes.
Pilkington then turned provider eight minutes later by supplying the cross from which Danny Cadamarteri headed Huddersfield's winning goal.
"In the end we feel we were worth a point, but I always thought we needed a second goal to make the game safe," said Trollope. "We must learn from that but you have to give credit to Huddersfield, who looked bright and sharp from the start. In the first half the ball kept coming back at us whenever we played in forward.
"The second half was much better and we had opportunities to build on our lead, but we didn't take them and got punished for it.
"The equaliser was a fantastic finish from their point of view, but we were defending too deep and let one of their players run 30 yards across the edge of our box in the build-up."