What term to search for "oversized" keycaps? - eviltoast

I’m looking for “fat”? keycaps similar to what Matias uses for Esc, Ctrl, Option, Cmd and Space keys on their ErgoPro.
What search term should I use to find similar keycaps? I’ve tried “tall”, “fat”, “oversized”, “big”, etc., but I only find extra wide (in the X direction) or extra tall (in the Z direction) rather than in the Y direction.
Any help welcome.