You are under prestashop 1.7.x and you are looking to display the tags in the “Options” tab on your product page. Here is the code you need:
{assign var=tags value=Tag::getProductTags($product->id)}
{assign var=id_lang value=Context::getContext()->language->id}
{assign var=product_tags value=$tags[$id_lang] }<ul>
{foreach from=$product_tags key=k item=v}
{foreach from=$v item=value}
<li><a href=”{$link->getPageLink(‘search’, true, NULL, “tag={$value|urlencode}”)}”>{$value|escape:html:’UTF-8′}</a></li>
{/foreach}
{/foreach}
</ul>
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