Form 1/4 cup (2 1/4 oz.) almond paste into 1/4-inch balls.
Scoop 5 cups vanilla frozen yogurt equally into 4 glasses (each 16 oz.) and top equally with almond paste balls. Add 2 tablespoons rum (1/2 cup total) to each glass, then slowly fill with cold cream soda, about 2 bottles (12 oz. each) total.