Get arbitrary user entity with tokens
There isn't a token that, given a user ID, would return data about that user account. current-user returns data about the currently logged-in user, while user returns data about the user account passed to the function (in Drupal 7, or the method in Drupal 8) that replaces tokens with their values: token_replace().

It would be possible, for a module, to implement a token that returns data about every user accounts. With such a module, for example, users:1:name could return the username for the user account #1, while users:2:name would do the same for the user #2.