It appears that there are currently only a few awards.
Here's a little more as suggestions:
darwin award - the hog which kills itself gets it. if there are more than one, the one that causes the most damage doing it will get the award.
leech award - the hog/team which kills the most enemy hogs, while causing the least damage to them - i.e. someone else has almost killed a bunch of hogs, and the next hog finishes them off
collector award - the hog/team which collects the most crates
collateral damage award - the hog which causes the most damage by using props - i.e. big falls, using crate explosions or mines, etc.