Can I disable a cookie from a contrib module, in this case fontawesome I believe
The Font Awesome Icons module provides an option to use the Font Awesome library locally rather than from a CDN. It's the CDN that is creating the tracking cookie, so if you follow the instructions to download Font Awesome to your own server, you should not have that cookie to worry about.
The Dropdown Language module simply extends Drupal's built-in language switching, which defaults to storing the language in the current session, so will not require any additional cookies.