I'm no expert on the subject but "cokes" refers to a grip style that Smith used on its guns but discontinued. The term "cokes" refers to the shape of the grips: viewed from behind they resemble the old 6-ounce Coca Cola bottle in shape. Superficially, they resemble target grips, but they are not shaped like targets.
I understand that genuine cokes are collectors' items in their own right and command premium prices. There are some grip makers who make coke reproductions. I have a couple sets of Nill coke reproduction grips on my Smith revolvers. They are beautiful and incredibly comfortable. They're also pricey, costing upwards of $200 per set. Forum member Kurac makes grips that are shaped somewhat like cokes and they cost a lot less than the Nills. I have couple of sets of his grips and they are superb!!!