A tatoskok is a type of sea serpent creature which inhabits Lake Champlain in the upper-eastern United States. The No-Maj population attributes sightings of such creatures as similar to that of the Loch Ness Monster in distant Scotland, however, in reality, the two species are unrelated.
The creatures were well known to the Native Americans, particularly the Iroquois and the Abenaki tribes. It was these tribes who gave the creatures the name "tatoskok."
In 1609, Samuel de Champlain was the first European to have sighted the creatures, but, being a No-Maj, he had no understanding of what they were.