To be fair, the name always said that. TTRPG = Tabletop RPG.
Plus you can look at submissions and see that pretty much all of them are exactly that.
Hello,
Sorry but your itch.io Jam's name it's "Showcase Jam 2020", only the Twitter name is "TTRPG".
You made a little mistake, I think, so most of the TTRPG games must come from the Twitter. And You are not clearly visible as a TTRPG Jam on the calendar, it's sad for you.
I almost made the mistake twice so it's not really clear, and I always read the rules :).
Whatever it's cool to have a TTRPG Jam even if you can't count on me to do a Narrative thing in English language :).