Not sure of with what to start, you puff up your body and attempt to look larger than you are. It's a trick you learned from your mother to frighten cave bears. Of course, it clearly didn't work on the one that ate her, but it worked for you once, and a 50% chance is better than nothing.
The troll looks at you curiously before also puffing his body up. With both of you now equally puffed, you find the size discrepancy right back where you started. The troll growls, and a small trickle of blood rolls from his chin to the breeze, and lightly splashes against your face. Quickly losing options, you raise your fists and attempt to summon what courage you have.
Uppercut! That's a thing, right?
Drop your fists and try to talk it down instead.