Reporting a vicious troll in ranked

I encountered a dou that troll picks every game and they attempted to troll pick my second ranked game. But thankfully someone dodged in the lobby, may God bless his soul. Just check out this player's Match History and tell me he's not trolling in ranked. I understand that players have bad games or bad luck but this is just insane they lose every game causing so many players to unjustly loose in ranked for these guys pleasure. (edit) I can't name shame so instead check my last match history these two dumbasses have the same name and have a track record of losing every ranked game My question is: Can Riot do something about this? This player and his buddy made us lose the game because they went adc leona and sup taric