Nintendo has a lot of active “super mario” trademarks with the USPTO, 79259975 includes the following:

G & S: IC 030: Tea; tea-based beverages; coffee; coffee-based beverages; cocoa; cocoa-based beverages; pastries; candy; ice cream; cookies; chocolate; popcorn; chewing gum; bread; buns; sandwiches; pizzas; pies; cakes; frozen yogurt confections; pancakes; crackers; mints for breath freshening; seasonings; ketchup; dressings for salad; cereal bars; oatmeal; corn flakes; noodles; pasta sauce.

https://www.uspto.gov/trademarks/search

This would limit the supermarket from carrying their own store brand product lines for these product types.

Off the top of my head I can confirm my supermarket stocks their own brand of :

Tea; coffee; cocoa; pastries; candy; ice cream; cookies; chocolate; bread; buns; pies; cakes; seasonings; dressings for salad; cereal bars; oatmeal; corn flakes; pasta sauce.

Admittedly my local is part of a large chain so this may not be typical but even independent supermarkets in my area tend to repackage bulk candies and chocolate under their own label.