Don’t remember those. I thought I saw Zero candy bars at H.E.B. in either Universal City or here in Schertzor maybe the 7 Eleven just down the road from work here.
I remember Mallow Cups which are still made.
I have an old 1920s Butler Brothers catalog.They sold merchandise to merchants and even had apparently some retail stores in various cities. Anyhow they had candy bars like Baby Ruth,,,but also Fat Emma,,Lindy’s Lunch Denver Sandwich,etc. These aren’t made any longer but they do give a description of each candy bar like French kisses
and they sound really good.