The physical games tags “tabletop-rpg”, “ttrpg” and “tabletop”* are almost certainly used synonymous. The tag “tabletop-rpg” seems the most transparent. And if it could be displayed as “Tabletop RPG” it would look a lot nicer.
.* I would describe Warhammer or BattleTech as “miniature wargames” if a tag for those was ever needed. Just “tabletop” doesn’t really tell the user much and those kinds of games can be played on the floor as well, I’ll have you know. ;)