Trolling - probably not. I don't even know if an enforceable definition of trolling exists here on this forum, much less anyone getting banned for that.
There is a definition of trolling on the Bitcointalk rules page.
Q: Do you moderate/delete (possible) FUD, accusations and untrue information?
A: No. We don't have enough time to check every single piece of information and verify the validity of the sources. Also, just like scams - too much room for bias and abuse.
However, trolling isn't allowed. If a user is habitually posting obviously false nonsense ("obviously false nonsense" to an outsider, NOT to someone who follows or is involved in the discussion) just to stir up trouble, then it's considered trolling, which is prohibited. Such cases should be thoroughly documented in the report though (There are tons of reports that just say "trolling", but moderators don't have time to look through each user's post).
Trolling (тpoллинг, п. 3) is indicated as one of the ban reasons for some members in the
Russian locale: gagik, tor676, Uvajaemy_Kit.