How do you report a fake account?
A fake account is an account where someone is pretending to be something or someone that doesn’t exist. Fake accounts can include accounts for fake or made up people, pets, celebrities or organizations. To report a fake account:

  1. Go to the profile of the fake account.
    • If you can’t find it, try searching for the name used on the profile or asking your friends if they can send you a link to it.
  2. Click  on the cover photo and select Give feedback or report this profile.

  3. Follow the on-screen instructions for fake accounts to file a report.

If an account is pretending to be you or someone you know, you can learn how to report it for impersonation

Source: https://www.facebook.com/help/306643639690823?helpref=uf_permalink