While it's always good to double-check the label, there's one brand of frosting that offers a wide range of vegan flavors. Though there are flavors that are not vegan, Betty Crocker frostings are ...

Although there are some organic or keto frostings at a higher price point, the main brands seem to be Pillsbury, Duncan Hines, and Betty Crocker. I purchased a can of vanilla frosting from each.