Sigh. Words seem to have lost meaning to some people.
A patent troll is a company who does not make products, like Lodsys, who uses their patents to go after other companies just for money.
Apple is either using patents to protect it's business or to drive others out of business.
Driving others out of business is not necessarily bad. If they own legit patents, it is totally fair to drive others who are doing illegal activities out of business.
That's a very narrow definition. Apple does not use most of their patents in real devices either. This should count as trolling too. In case of Lodsys, at least some of their patents are real (Apple licensed some). Most Apple patents are useless. They seemingly can never win a patent related law suit.