Yes, this can be done with Tag Groups. To create a tag group, go to your tags index page (/tags). Choose “Manage Tag Groups” from the top right menu.

Create a new tag group with the tags you want to restrict to staff members. Tag groups give you three options for how the tags can be used:
- Tags can be used by everyone
- Tags are visible to everyone, but only staff can use them
- Tags are visible only to staff
Select the last option so that the tags can only be used and seen by staff.