I’ve never heard of it, but a search turns up “Bettercreme,” mostly sold to cake decorators. I’ll stick to traditional homemade buttercream vs these ingredients:
HIGH FRUCTOSE CORN SYRUP, HYDROGENATED VEGETABLE OIL (PALM, PALM KERNEL, COCONUT AND/OR COTTONSEED), WATER, COCOA ALKALI PROCESSED, CONTAINS LESS THAN 2% OF THE FOLLOWING: SODIUM CASEINATE (A MILK DERIVATIVE), SUGAR, POLYSORBATE 60, CARBOHYDRATE GUM, SALT, TO PRESERVE FRESHNESS (POTASSIUM SORBATE), SOY LECITHIN, POLYGLYCEROL ESTERS OF FATTY ACIDS, ARTIFICIAL FLAVOR, SOY PROTEIN CONCENTRATE, XANTHAN GUM.

My local market calls it best crème, but I think it’s buttercream?

Anyway, these are the two choices of cake and cupcake frosting on offer.

Are you a traditional or a best crème person?