In Games

I have never seen one out in town, even for the N64.

According to Gamefaq's release data, only the following games were released in Japan.

Gauntlet IV (GEN)
Gauntlet Legend (N64)
Gauntlet Dark Legacy (PS2)

So no, not only were there no games released for Famicom, but Gauntlet games are pretty much impossible to find over there.

Note: Commodore 64 games have stated worldwide releases for all their games, however this cannot be confirmed from me.

I can look it up in my Famicom complete guide when I get home.
A short search on google didn't bring results so I think there may not be a famicom version.