Saw this in an episode of Vikings. I've done some google searching and I can't find it. Maybe I'm using the wrong terms.
It rolled down a ramp, built speed, then rolled down a hallway, killing as it went.
This looks like something inspired by the boulder trap in the opening scene of Indiana Jones and the Raiders of the Lost Arc. It doesn't look like anything I've seen in Viking-Age primary sources, and archaeological remains of defenses typically look more like wooden palisades and earthwork ramparts. I don't think this weapon would belong.
Keep in mind that most of our accounts of Viking-Age combat are brief and allusive. If you're looking for information on pitched battles, you'll need to look at Old English poems like Maldon and Brunanburh. For attacks on fortifications, the best account is a lesser-known poem called Bella Parisiacae urbis, or "The Beautiful City of Paris." It describes the siege of Paris in 885-886 and was written about 10 years later.
Unfortunately, I don't think this has been published in a freely available format. If you'd like a look, you'll have to search for it through your library. If you're not sure how to do that, just email them and ask if you can get access to the following link.
Adams, Anthony, and A.G. Rigg. “A Verse Translation of Abbo of St. Germain’s Bella Parisiacae urbis.” Journal of Medieval Latin 14 (2004): 1–68. https://doi.org/10.1484/J.JML.2.304214