Is there a way to use noindex or nofollow tags on specific Googlepages pages?

i think u have to register ur site in http://www.google.com/sitemaps.
add sitemaps to ur site
   it may take 3 days to find ur site
  
then u have option called
under Tools
robots.txt analysis
add noindex or nofollow

or otherway

add in meta tag of ur site

You can't edit the meta tags (or the head) in Google Pages. All you can do is upload html files created with other tools (like Notepad).

hmm. So, could you create a page, with proper meta tags, and then upload the html file? Or would google page creator just nullify those heading/meta tags?

You can upload a file that happens to be a HTML file, but you can edit it using Page Creator.

Could you register a Googlepages site on Google Sitemaps?

You can. Just upload the file mentioned in the instructions.