Alt. Hist. request, Vikings make a go of the "New World"?

[GUBU]

It is unlikely they had an interaction.

https://www.pc.gc.ca/en/lhn-nhs/nl/meadows

We know that when Europeans actually did make contact with native-americans the N-As died in droves from European diseases.

lead poisoning?

Disease, either inadvertent or deliberate. And followed by slavery soon after. Vast civilisations, generally on a par with Europe (aside from metallurgy, seafaring and gunpowder) were destroyed (and not just the Inca and the Triple Alliance either, you should look up the Mound Builder civilisation of what is now the Central US, a large network of culturally connected cities and towns which disappeared, likely due to a mass epidemic introduced by Henry de Soto's pigs in the 16th century).