I think all types are prone to trolling. The real question to ask is when types troll, how do they troll? Because there are different methods for each type. I don't want to generalize, but from my experience here are some different methods each type tends to fall into:
INFJs are the social experiments of trolling. INFJs find it amusing to troll people in a way that will test how people will react under certain circumstances and they get their pleasure and laughter out of seeing their "traps" work. They will often set up deliberate situations with pre-determined ways as to how people should react, and their amusement comes from when people react the way that they predicted they would and "confirm" their predictions. INFJs also tend to get upset if their trolling backfires and people react in ways that are contrary to what they had anticipated, this can often make trolling unenjoyable.
NP types, most of them, troll via seeing if they can get someone to react to something. NP's typically don't have a specific way they think the person should react- ANY reaction at all is good enough for them, the fun is seeing if they can get people to respond. With ENP's, they prefer to do their trolling in real life, and they also tend to troll strangers and large groups of people. with INP's they tend to want to troll either on the internet or someone they know really well. The idea of trolling a complete stranger just isn't appealing to an INP.
SJ types are all about seeing if they can get someone to do something. This is very similar to the INFJ, but different because the INFJ is speculating about what they think the person is going to do. SJ's don't speculate as much- they live in the moment and are more keen on seeing what actually happens, much like a NP, but they are different because their fun of the trolling is to see if they can influence someone to behave/do/perform in a certain way, whereas N's , both NP's and NJ's, are more concerned with seeing if someone will simply react, and no action is required to satisfy their trolling.
So in terms of online trolling more often you're going to see IN types trolling, because they are most comfortable trolling online than in person, and they are more desiring reactions from people rather trying to get someone to "do" something or "get into action" because of it.
My mom, who is an INFJ, loves to mind fuck people by pretending to be different people and saying different things, social experiments so to speak, and her goal is to "trap" someone in a way, I don't know how to describe it better. But she does laugh and get a kick out of it when people end up doing what she thought they would do, she does do it for laughs for sure. Like my mom one time got a cup with my dad's name on it and decided that when we gave it to him we should pretend we got it from the goodwill to freak him out and say we bought it because it was weird to see a cup with his name on it, and she was wanting to "Freak" him out and make him think like an ex girlfriend or something left it there. Well, when we did go in and tell him he was like "....What the fuck? I've never seen this cup before in my life!" And then we told him we was joking and my mom was amused because he did indeed think that a girlfriend or something donated it to the goodwill initially. So INFJs do in fact troll/prank people for fun.
