Drupal - Can I delete nodes of a given content type with Drush?
Install the devel module, and use drush to delete all the nodes,
$ drush genc --kill 0 0
You can also give a type option,
$ drush genc --kill --types=article 0 0
Drush 9
drush entity:delete node --bundle=my_content_type
I guess you can by using the below command
drush node_delete <nid>
EDIT: Found a module that does something/related to the question
http://drupal.org/project/delete_all
Usage
Drush
drush delete-all
Example: drush delete-all article