I agree with Opium Pour Homme, that's what I thought of right away.
But the answer is yes, to the opening post/question. Black Phoenix Alchemy Lab has had 2......
Anti-Salloon League: "Our version of a Black Cow, a 1920’s virgin thirst-quencher: sarsaparilla and cream". It was only available for a couple days at a comic convention in Chicago, and so it is pretty hard to find now.
Stimulating Sassafras Strengthener: "Sassafras, vanilla extract, oak leaf, CO2 butter extract, and onycha". This one is more like straight-up root beer, with less of the powdery/creamy aspect.