Import a FTP or SFTP Blogger blog into WordPress
The fantastic WordPress import feature (which can be found under “Manage” => “Import”) does not support importing Blogger blogs that were set up to publish via FTP or SFTP. It works fine for the other two types of Blogger blogs: standard and “custom domain”, but for FTP/SFTP published blogs you can see the blog but it shows 0/0 posts and 0/0 comments.
I found out after a lot of digging today that it is possible to import this type of blog. All you have to do is first convert it to a regular Blogger blog and then import it. To do this, login to your blogger account dashboard and click on “Settings” => “Publishing.” Then choose “Switch to: blogspot.com.”
Pick a random subdomain address and let blogger do its thing. After you’ve converted it, WordPress will import it without a hitch. You can even switch it back to publishing via FTP or SFTP after the transfer was a success.

Thanks for posting this, I need to move my FTP-Blogger site to Wordpress and couldn’t find any instructions or even find out if it was possible.
Thx,
JP
@JP: you’re welcome! that’s exactly why I posted this. it took me a lot of digging to figure it out.