I think the Beans you felt were just Hemp and no coffeseeds, they are smaller than Coffebeans in case.
Again, im shure it is just Hempseeds, or a mix . I know Cannabis or Hempseeds have a very Nutty, earthy Taste, close to Coffe so ist very likely to use it as Alternative to Coffe wich some People dont like . Or it is cause some People want to Healthbenefits from Hempseed, again it is one of the healthiest Foods on Earth i heard.
Try it, from Experience taste of Hempseed is not that easy to cook/bake, but you could try it, if done well, just Hempseed fresh mixed in water i like it.