Yes! You are able to track if someone forwarded your emails by the "Share" tab on the Response page for your mailing. Here it will list who shared and on which platforms (Twitter, Facebook, email forwarding, etc)! It will not, however, show you who the email was shared with due to privacy concerns. I've attached a photo to reference what it will look like if someone shares your mailing.
Here's an article that explains the Response page and the Share tab specifically if you would like to take a look.