In my most recent game, I just had a support Nunu troll me and gave away 10 kills 14 minutes in to the enemy AD Carry because he didn't get to go mid as an AP Carry. His name was "rabbitsch" without the quotations. Is it possible if I can get a answer to my problem here?

Bump for awareness.

Nobody here can help you. Report the person after the game and move on. If for some reason you feel that more action needs to be taken (which it REALLY doesn't sound like it does) you can take screenshots and submit a ticket to Riot. But do you really want to bug them with such a minor issue which is already covered by a system to help alleviate the flood of complaints they are sure to get?

Well, I dced right as the game was ending so I didn't get the chance to report the other person.

Well, if you did that on purpose, don't do that next time.

Also, did you ever stop to think that maybe... just MAYBE, you aren't the only victim of this person's trolling? Other people will report and the person will end up in the tribunal if this is a habit.

Naming and shaming on the forums is against the rules. Submit a ticket, and Riot can look into your game history.

People saying "use screenshots." I don't believe those are effective. While it's useful, people forget that screenshots can be easily doctored to show the results you want presented as opposed to what actually happened. I'm pretty sure Riot has the tools necessary to look into match histories and all players of the games that you were in.