There are a few things that are a bit too vague here.
First off; is the reason you suggest this because you want to win a game, yet having a troll assumes that you are going to lose so you dodge assuming that with the troll you have 0 chance of winning? or you feel the troll is just going to flame during the whole game and ruin the feel of the game win or lose?
If it is the first reason, then that is just you not having faith in yourself and the three other players to work as a team and win. Just because someone says that they're going to feed does not make the game an automatic lose or that the person will even commit to what they say. Sure i do admit that it makes it a lot harder to play to win but doesn't mean a loss. Also take into count that things said in champ select mean nothing game wise because what you say in champ select will not influence the mechanics of the game only your mentality. Trolls will only affect you if you let them. There are many games where a team has a troll or afker or both yet still win, sometimes the win is a solid stomp too where they completely steamroll the other team. Chances of winning will never be zero just cause of trolls. One only loses if they choose to give up.
So suggestions on ways to help with this are; to go into champ select and in-game with a clean and positive mindset because you only feed a troll with more incentive to troll if you get negative, to just play the game through because you may have a troll but the other team might be in a worst situation be it teamwork or an afk or even their own troll, and to have faith in yourself and your other teammates because they want to win too. And this is all with the goal in mind of winning the game because there is always a 50/50 chance that you will win a game with a troll or afk but a 100% chance that you've lost that game because you dodged. So having a report function in champ select is useless because where is the evidence when the game doesn't even exist?
Now for the second reason. This one is a lot simpler because if you don't care about winning or losing than just play the game to have fun and ignore the troll. Don't get me wrong, winning can be fun but it's not as fun when it's with someone that flamed you. For this you just either dodge because you're not feeling up to playing the game with a flaming troll or you play the game how you want to play and learn and have fun and just report the troll for the things they did because when someone says "f**k you guys, I'm feeding" and then actually intentionally feeds, that's report able. You probably will say 'he/she won't get punished though'. He/she will if they continue with their behavior. Of course making sure you accurately comment in the report adds more evidence against them. Beside once you're done with the report it's off your hands and you're done with them.
Honestly though, just play the game. Complaining about trolls but dodging games mean the trolls have won and you're just losing lp plus there is no report or evidence so the troll walks free because you dodge. Also if you get in-game and start raging then the troll succeeds in pissing you off and making you no better than them.
Of course this is just my thoughts and opinion. Just wanted to get my two sense in. ^_^
If there is an error in anything, please feel free to point it out. I appreciate the feedback.
