Not that I'm aware of. You could do it with regular wordpress that you hosted yourself and some coding but, since we don't have access to the underlying theme files, we can't do that here.
You could just add the Voki to the contents of a Page though. That may work for you.
I have placed a voki avatar on the sidebar of my blog. I have added 2 pages on which I DON'T want the voki. Can I remove the voki from the sidebars of my pages but keep the one on my blog page?