A loop with all articles with certain text strings in tags

Based on @birgire’s always-useful comments, I did write a workaround for you. What I’m doing is to first find the terms that match the search string. Then, based on the found terms I will do a query in those.

function wpse_posts_by_tagname( $string ) {

    // Let's find every tag that has 'coffee' in it's name
    $term_args = array(
        'taxonomy'             => 'post_tag',
        'fields'               => 'ids',
        'name__like'           => $string,
        // 'description__like' => $string, // You can also search in description. 
        // 'search'            => $string, // We can even search in the term's name! 
    );
    $terms = get_terms( $term_args );

    // Let's make an array of term IDs
    if ( empty( $terms ) || is_wp_error( $terms ) )
        esc_html_e( 'No matches found', 'text-domain' );

    // Alright we got'em, now query based on these
    $query_args = array(
        'post_type'      => 'post',
        'tag__in'        => (array) $terms,
        'posts_per_page' => 10 // Optional limitation of posts per page
    );
    $tag_query = new WP_Query( $query_args );

    if( $tag_query->have_posts() ){
        while( $tag_query->have_posts() ){
            $tag_query->the_post();
            the_title( 
                sprintf( '<h2><a href="https://wordpress.stackexchange.com/questions/274014/%s">', esc_url( get_permalink() ) ),
                '</a></h2>' 
            );
        }
        wp_reset_postdata();
    } else {
        esc_html_e( 'No matches found', 'text-domain' );
    }
}

Also it’s worth noting that you should use WP_Query instead of query_posts. There are endless articles on the internet about this, so I’m just gonna skip this part.

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