In Scrooge’s day, geese were farm-raised. Turkeys were wild game and thus, rarer. Besides, you recall, the bird Scrooge sent the Cratchits was the “PRIZE turkey” in the butcher’s window—the biggest one in the shop.
A cooking friend of mine once roasted a goose for Christmas dinner. Even after saving half a gallon of the rendered fat for pastry recipes, he had to throw away the rest.
Calling it “Turkey Day” sidesteps potential disagreement over the indians-and-pilgrims narrative. Happy T-day!