Display posts with tag that matches current post title

The query would look something like this:

$title_tagged_posts_query = new WP_Query( array(
    'tag' => strtolower( get_the_title() )
) );

while ( $title_tagged_posts_query->have_posts() ) : $title_tagged_posts_query->the_post();
    //Output whatever you want here.
endwhile;

This assumes that the tag slug for “Hippo” is “hippo”, which should normally be the case.