That's not strictly a programming question, it's more a "does blogspot allow you to insert directly into the database" question. If they do, just write a SQL query that inserts into blogspot, selecting from WordPress. You can almost certainly import your articles and comments and probably your users.
I actually exported the database from a self-hosted wordpress blog, it took a while to upload to blogger the .xml file and then I had to manually publish each and every post.