I realize this is a difficult question to answer, but perhaps there are fragments of written attestations that have survived thus far. Thanks!
hi! more contributions are always welcome, but meanwhile, you may be interested in responses in these earlier threads
Aboriginal perspective
Do any Native American/First Nations peoples have any oral traditions or tales about the Vikings?
Is there any record of Norse settlement in Native American oral tradition?
Norse perspective
Do we have any idea as to what the noisy weapon used by the natives in the Vinland Sagas is?
Non-Saga sources describing interaction between Norse and Skraelings?
miscellaneous