What Are Frames on a Blog? Does they Matter For SEO

You mean “iframe”s or “frame”s?

It’s iframe’s….

iFrames are really easy ways of importing content onto your website
https://whatis.techtarget.com/definition/IFrame-Inline-Frame

Your “AddThis” plugin is using iFrames, so you could disable that plugin or post in your plugin’s support section (find your plugin and then go to the “support”tab).

Can You Tell me any other Plugin for sharing/??

I can’t tell you another plugin that doesn’t use iFrames for sharing buttons, because it’s YouTube, Twitter, Facebook, etc. that provide the iFrames and the plugin just utilises that

There might be plugins that don’t use iFrames but I dont know of them