‘There’s never been a Viking helmet found with horns,’
No horns? I’m pretty sure there’s never been a 15 foot Viking either.
this suggests that there were horned helmets in the area at one time, but just because we have not found a recent one really does not prove anything.
I would suspect that such helmets were reserved for the highest rank as depicted here


And in Price Valiant comic strips! Even Winged Helmets!
It has to be historical? How much crap modern art out there and the complaint is this?
How about a satan statue in Illinois or whatever? How do we know he has horns?
The Viking horned helmet seems to have originated with a costumer who gave such a helmet to Brunhilde the Valkyrie in the Wagner epic Ring opera. Although some illustrations show her with a winged helmet, the horned image stuck in the popular imagination.