If you are using the WP Discourse plugin, the wp-discourse-shortcodes plugin might do what you are looking for. It extends the WP Discourse plugin to add a discourse_topics shortcode. It can be used without any attributes to give you a list of the 6 latest topics on your forum. Attributes can be added to the shortcode to control how many topics are displayed, and whether or not you would like to display an excerpt along with the topics. The attributes are documented in the plugin’s README.
With the excerpt_length set to 55, it will display something like this:
To install the plugin, you’ll need to download it as a zip file from it’s GitHub page: https://github.com/scossar/wp-discourse-shortcodes