> Did they integrate with existing Native Americans?
According to the article, no:
"The Icelandic sagas suggest that the Norse engaged in cultural exchanges with the Indigenous groups of North America. If these encounters indeed occurred, they may have had inadvertent outcomes, such as pathogen transmission, the introduction of foreign flora and fauna species, or even the exchange of human genetic information. Recent data from the Norse Greenlandic population, however, show no evidence of the last of these. It is a matter for future research how the year AD 1021 relates to overall transatlantic activity by the Norse. Nonetheless, our findings provide a chronological anchor for further investigations into the consequences of their westernmost expansion."
edit: re-reading this, they may have if they never returned to Greenland
According to the article, no:
"The Icelandic sagas suggest that the Norse engaged in cultural exchanges with the Indigenous groups of North America. If these encounters indeed occurred, they may have had inadvertent outcomes, such as pathogen transmission, the introduction of foreign flora and fauna species, or even the exchange of human genetic information. Recent data from the Norse Greenlandic population, however, show no evidence of the last of these. It is a matter for future research how the year AD 1021 relates to overall transatlantic activity by the Norse. Nonetheless, our findings provide a chronological anchor for further investigations into the consequences of their westernmost expansion."
edit: re-reading this, they may have if they never returned to Greenland