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.

espen

Based on a meta refresh tag on blogspot this plugin will redirect 
blogger permalinks to the correct wordpress post. Requires Blogger 
Redirector by Sam Wong 
(https://wordpress.org/extend/plugins/blogger-redirector/).
Why this in addition to the Blogger Redirector plugin?
Because Blogger changed the redirect for a custom domain and no longer 
returns a proper 301-redirect. Thus the only way now to redirect both 
visitors and search engines crawlers is to use a META refresh in 
blogspot.

Blogger Blogspot To WordPress Redirection

migration, pagerank, redirector
Requires at least: 2.0
Tested up to: 2.7
Stable tag: 1.0.1

Redirect permalinks from your old Blogger Blogspot to your …

Blogger Image Import vs Blogger Blogspot To WordPress Redirection