Using wp_tag_cloud(‘format=array’) to print tag names without links?

try :

function my_tag_list_123($sep){
    $tags = get_tags();

    foreach ($tags as $tag){
        $ret[]= $tag->name;
    }
    return implode($sep, $ret);
}

and call it when you need like this

echo my_tag_list_123(',');

hope this helps.