My Gravity forms creates a Woocommerce order but I want to exclude a certain form

Try this :

add_action( 'gform_after_submission', 'gravity_form_submitted', 10, 2 );

function gravity_form_submitted($entry, $form)
{
  if($form['id'] != "exclude_form_id")//if multiple you can check not in array
     { 
        //your order generation code
     }
}

Form Object $form