Well Bb, you know, I think I recall one of these sorts of 'oatcakes' back in the mists of my memory. They were the sort of dry, vile thing that your gran might bring back from a day out in Harrogate (as if to underline how thankful you ought to be for being Lancastrian and only ever having to tackle such things as black pudding
).
They aren't any day-to-day part of the Tyke diet however, unlike the superior Staffordshire oatcake, which is eaten by natives of the county daily (and also by me when I can get them).
However, going back to po-ta-toes, I still rather like the idea that Lembas was basically potato cakes.