By "action troll" I mean, not talking, but with actions.
Me was yesterday. Should've guessed something was wrong when Jax/Blitz let Gragas 1v2 the bottom lane, then started losing the lane badly to Garen. Wasn't their fault, it's GAREN ! Then, they proceeded, not only to feed, but also to grief.
I figured what the hey, let's try to win this, so I got in tryhard mode. At some point, I'm doing dragon with Kogmaw; Blitzcrank comes through the back, and pulls it out of the nest so it reset. He did this twice.
The sad thing is, at some point the other 3 (Gragas, Kog and me, WW) decided to just stay at fountain and let them win, and told them in /all, since we had no shot at winning. The two trolls started defending, and in a 2v5, they killed 3 and forced the other 2 to retreat, without dying themselves. We still let the other team win, as they probably would've trolled again anyway, but I was so mad...
Coolstroybro, I know. At least my team and most of the other team reported them (fat good that'll do, but hey)
EDIT : The first part where they're losing to Garen.. I mean, to Garen and Garen only. They were 2 versus only Garen, and they couldn't do anything.