It's not uncommon to hear people refer to early post-timeskip Thorfinn as Viking Kurt Cobain due to his appearance.
Much like how in Code Geass Suzaku would have several nicknames with "something"-zaku, most of Canute's nicknames follow the same pattern. Earlier Canute is referred to a Moenute, after his Rage Against the Heavens he's Garnute, and more recently he's become Jerknute.
This is extended to Thorkell, who is called Moekell for his goofier moments.
The first post-Time Skip arc is called "Farmland Saga."
After Farmland Saga, the next and current arc was called "Merchant Saga" or "Boatland Saga" before it took an unexpected turn into the "Baltic Sea War" (as actually titled on-page). Also, due to certain unprecendented developments, "Romcom Saga".
Vikings hauling their ships across dry land is historical fact, and eating hallucinogenic mushroom is one of the proposed theories about berserkers (though at this point it's not considered terribly likely and no contemporary sources have indicated it).