I am using mb fronted submission for custom post type and i see there is comment meta available on wordpress.org as free https://wordpress.org/plugins/mb-comment-meta/ but i am not found any documentation about it. I want to use comment meta with frontend submission there is any tutorial for it it will help me and also other people who want to use comment meta.
Important question is mb fronted submission will work with comment meta it will allow comment meta and comments submission from frontend
To use the MB Comment Meta, all you need to do is replacing post_types rule in Meta Box by 'type' => 'comment'. That's just simple.
Anyway, comment is a special content type in WordPress and it uses a totally different API to save content. Unlike posts and custom post types, the content for comments is different. So I'm afraid the MB Frontend Submission can't work in this situation.