Let's see...
NOT British.... German, Scots/Irish/Gaelic/Ridgerunners, Senneca and Blackfoot ... all cultures with history of displaying vanquished enemy bodyparts prominently.
Sure, I believe anyone can be a barbarian with a little education and also believe the world would be a better place with more goblin heads on sticks in goodguys' yards.
Burning is a waste and smelly, rest of offal would go into manure spreader/chopper for distribution on crop fields.
That would be an insult to honorable catfish trophies.