Nah, it's just scotch grain. It might be calf embossed with a pattern, or considering the quality of those shoes, might be legitimate scotch grain- which originated as calf soaked in scotch as part of the tanning process, which is what gave it the pebbled appearance. More expensive sure, but the finish doesn't tend to look like someone stamped it on.
According to well-kept, it is tanned in the used whisky mash:
Awesome shoes, OP.