Tim Eckel

With this plugin, newly written WooCommerce product reviews will be in a pending (hold) status until manually approved.
Product reviews in WooCommerce are immediately available for everyone to see (this can’t be changed without this plugin). WooCommerce ignores the WordPress “comment must be manually approved” discussion setting. With this plugin, new product reviews must be manually reviewed and approved before being visible on the front-end.

Manually Approved Reviews for WooCommerce

Force WooCommerce product reviews to be manually approved.

Middelkoop.cc

FeedbackCompany

This plugin enables you to display trusted, verified store review widgets on your WordPress website, as well as product review widgets in your WooCommerce webshop. You can also send automatic review invitations to customers. This plugin requires an API key from Feedback Company to function.
<ul>
<li>Compatible with WooCommerce (product reviews & review invitations)</li>
<li>Compatible with WPML and Polylang (multilanguage support)</li>
</ul>
After installation of the plugin, you will find configuration instructions on the settings screen.

Feedback Company

This plugin integrates Feedback Company review widgets and order registration into Wordpress/WooCommerce

Manually Approved Reviews for WooCommerce vs Feedback Company