There is no such thing as trollpick, and you cant do anything about feeders except getting fed yourself if u are more skilled than opponents. If you arent, then you would lose anyway, even without said feeder. If person is feeding , it only means he plays against more skilled opponent. You can offer him to lane swap after his first or second death.
Things that qualify as trolling are things where people buy boots on lvl 1 and run into enemy turret to die on purpose, giving kills to enemies without attacking them. You can report those.