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.

amtbtk

With this WordPress plugin, you can easily export WordPress data to Blogger(Blogspot). 
No need to use software and convert by yourself anymore! This plugin exports dedicated xml files directly, so what you need is just import it to Blogger.
<a href="https://livdir.com/am-tb/wordpress2blogger/en/" title="Export to Blogger WEBSITE" rel="nofollow ugc">For more information, please visit our website.</a> 
*How to Use 
*Q&A (e.g., Does this plugin support moving images?) 
*Terms of Use

Export to Blogger

Export Wordpress data to Blogger(Blogspot) XML.

Blogger Image Import vs Export to Blogger