The term Thomasson comes from the professional baseball player Gary Thomasson, who was signed by the Yomiuri Giants for a record-breaking sum of money, and spent his final two seasons with the team (1981-1982) coming close to setting the league strikeout record before being benched [REF].
In Japanese there is no differentiation between singular and plural versions of the noun Tomason, therefore in English too, Thomasson can refer to one or many of these objects.