You have to try and beat him. If you can beat him then you can stop him from farming. If you can't then just TP when a fight breaks out over an objective. For instance, if a fight breaks out mid and you guys win because of your teleport, push and take the inner mid turret as well. That way you trade inner top for inner mid.
If you fight for dragon and win, take dragon and bot turret so you trade bot for top. Every time Trynd takes a tower, he makes it harder for himself to farm if you freeze the lane. If you teleport was successful and pushed several objectives, then your jungler has no option but to gank a lane. The first lane that's going to be pushed the most is top, so remind your jungler of this.
You can ask mid to cover top, and jungler to cover mid if you teleport bot. As soon as the match starts, tell your jungler or mid that you plan on using teleport whenever bot gets ganked to counter-gank. If your jungler is farming bot, it's easier for Mid to rotate top. The easiest lane to cover is mid, therefore mid rotating top is the most optimal situation since the jungler's route is unpredictable.
I hope that made sense :)