Wikipedia talks about it briefly with an unsourced sentence:
Evidence supports the idea that the Thule (and also the Dorset, but to a lesser degree) were in contact with the Vikings, who had reached the shores of Canada in the 11th century
So that got me curious as to what the evidence was, and what we know about this contract
While there will always be more to be said and I'm willing to answer any additional question relevant to OP's question (unfortunately within 16-24 hours, not earlier, due to my job), I hope these previous posts of mine might satisfy OP's curiosity at least a bit: