I was wondering if I could make and upload multiple games to the game jam. 

I'd guess you can only upload one game, but even if you could make several why not spend your extra time polishing that one special game? :)

i don't think so

I'm going to say no, because ideally you should be creating and working on one game and focusing on that one. If you want to make more, why not join other jams?

In this game jam, you can only upload one game submission.