This question has been answered by BobRay. See the first response.
<p>Template Name: [[+description]]</p>
<p>Template: [[GetTemplateName? &templateId=`[[+template]]` ]] </p>
/* GetTemplateName snippet */
$templateId = $modx->getOption('templateId', $scriptProperties);
$template = $modx->getObject('modTemplate', $templateId);
if ($template) {
$output = $template->get('templatename');
} else {
$output = "error getting template name";
}
return $output;