Ĝ. Bejm

I realize this is decades after the fact, but just in case it helps someone else (I'd been curious about this for years)... I think Madame Trunknose's "Celtic Tarot" cards in "Return to Inverness" (one of ZBS's Jack Flanders adventures) are the Greenwood Tarot by Mark Ryan and Chesca Potter. The design of the Fool card matches the details they mention, and it came out several years before "Return to Inverness" was released.