Appreciate any guidance on this.
		
	 
	
	
	
 
		
			
	
	
		
		Please look here and you will see a widget:
Theocratic Software
It is the “bbPress Forum Statistics” widget.
		
	 
	
	
	
 
		
			
	
	
		
		this will display any topics which have no topic tags I think
add_shortcode ('empty-tags' , 'rew_empty_tags' ) ;
function rew_empty_tags () {
	$args = array( 'post_type' => 'topic', 'posts_per_page' => -1 );
	$loop = new WP_Query( $args );
	$output = '' ;
	while ( $loop->have_posts() ) : $loop->the_post();
		$current_id = get_the_ID();
		$topic_tags = bbp_get_topic_tag_names( $current_id );
		if (empty ($topic_tags)) $output.= '<br>'.$current_id ;
	endwhile;
	
	return $output ;
}
create a private page and put the shortcode
[empty-tags] in it
		
	 
	
	
	
 
		
			
	
	
		
		Interesting. When I try that it yields the following output:
7415
6447
5612
5386
4601
4466
4182
4027
3754
3753
3614
3542
3372
3368
3189
3101
3061
2508
		
	 
	
	
	
 
		
			
	
	
		
		I think this is not the same thing. This is listing posts with no tags.
The summary is reporting tags with no posts. So we must have two orphaned tags.
		
	 
	
	
	
 
		
			
	
	
		
		I don’t know it this helps and I did not test it with bbpress. 
This plugin finds and deletes unused tags: 
Mass Delete Unused Tags