first off, sure! corrrosion on a plug/plug wire can make it stop in the middle of a run...gotta be good spark or you are dead in the water. Second off you are bit vague. Is it the pug or the wire that is coroded? if it is the plug you could sand off the corrsion and prolly be ok, but they are cheap and easy to change, I'd go ahead and replace it (after gapping the new one correctly).
If it is the plug wire, check and see where the other end mounts to the coil. Does it plug in or have screw on connectors? I'd want to replace that. Take the old wire to a good cycle or mower shop.
wait for other answers