Gren will be eating a mix of the good and organ meats. They'd need to be cooked if Lola was here anyways, so it's just a matter of which one he eats. I would hope not to worry too much about sicknesses or diseases or chances are most of us might be dead from an infection or diereaha long before we reach adulthood. 

I don't imagine a tribe of orcs who still use stone tools to have a very well developed medical or sanitation level that isn't "slap magic paste on all your wounds" and "clean all the dishes, laundry, and bodies in the same river we drink, cook, and shit in". I just assumed orcs are naturally more resistant to those sorta diseases than contemporary humans are, or else we'll find out real fast why plague is a horseman of apocalypse.