Poco

This plugin searches your blog posts for images that are hosted on Blogger (blogger.com or blogspot.com), 
downloads them to your server, and updates your posts to refer to the downloaded versions.

Blogger Image Import

A plugin that copies blogger hosted images to your local server and updates the links within the posts.

Stephanie Leary

Allows you to import only selected content from WordPress, Blogger, or Tumblr sites. From the Pending Imports queue, you can select which posts to import, and which content type they should become (posts, pages, or any custom post type).
Sponsored by <a href="http://pressbooks.com/about/" rel="nofollow ugc">PressBooks</a>.

Selective Importers

Importers that put the incoming content into a queue, where you can select which posts to import.

Blogger Image Import vs Selective Importers