This is a reported credit, not yet a fully verified one. Japanese-language listings connect George to a 1988 Nissui commercial for “Umi no Pilaf” (海のピラフ) and describe a full-body merman (半魚人, hangyojin). No viewable copy of the spot or production credit has surfaced, so the attribution stays provisional.
Descriptions of the commercial mention scales, webbed hands, a dorsal fin and gills. Without the footage, none of that can be checked. The reported 1988 date would place it beside A Nightmare on Elm Street 4 in his filmography. His only earlier possible commercial credit, Collector (1986), is equally unconfirmed.