Point in fact I had a VERY large queen trigger. He was so aggressive I named him Mr. Stophales. (he was the devil). He literally ate his way through my tank, in the process killing a Niger Trigger, a Lunare Wrasse (a long time inhabitant and aggressive to boot), 2 lookdowns (that were in the tank for a total of 20 minutes while I was working on another tank. In fact the only thing he did not kill was my eel, a yellow tang (go figure), and my porcupine puffer. The point is if there was ever a trigger that was going to kill a puffer... Mr. Stophales was the one, and he did not kill him. I did see him go after the puffer once, but he simply puffed up and sat there looking at him, like bring it on dude.
Also my Niger and Puffer had been together for over a year with no problems. I would suggest a Huma, or a Rectangularis, or Niger, as they are all pretty mellow and should be fine.
Mit freundlichen Grüßen