How can I see my drupal site as a anonymous user while logged in as admin? I want to use Devel Themer to look at the "homepage" comment field, but it only shows up for anonymous users. 

Is there anyway to see a page as a anonymous user would, and at the same time be logged in as an admin so that I can use the Devel Themer module?
No that is impossible.

What you could do is give access to devel for all users. You shouldn't be using devel in a live environment anyways, so just make sure you remove devel and revoke permissions before staging to production environment.