add title to front page teaser news feed
If you look at the page.tpl.php template file used by the Bartik module, you will notice it uses code like the following to render a region.

  &lt;?php if ($page['triptych_first'] || $page['triptych_middle'] || $page['triptych_last']): ?&gt;
    &lt;div id="triptych-wrapper"&gt;&lt;div id="triptych" class="clearfix"&gt;
      &lt;?php print render($page['triptych_first']); ?&gt;
      &lt;?php print render($page['triptych_middle']); ?&gt;
      &lt;?php print render($page['triptych_last']); ?&gt;
    &lt;/div&gt;&lt;/div&gt; &lt;!-- /#triptych, /#triptych-wrapper --&gt;
  &lt;?php endif; ?&gt;


node--teaser.tpl.php is not used to render a page, but a node into a page. It is hierarchic, someway: html.tpl.php wraps the content of page.tpl.php, which wraps the content of node.tpl.php.
Regions are part of a page, not a node; therefore, the template file where to render the regions is page.tpl.php or any suggested templates used instead of that one.