What do you think this word means croatoan?

One might use "Croatoan" to mean "mysterious" but it would depend on context. "Croatoan"doesn't have a standard dictionary definition.

"Croatoan" was the Word carved into an abandoned fort where the Roanoke colony had been. The colony was formed in 1587 and abandoned mysteriously sometime before August 1590. No one really knows what happened to them. There was a local tribe of native Americans called the "Croatans" (only one "O") so one theory is that the colonists were absorbed by that tribe.