A lot depends on how you draw the lines around the Enlightenment and around philosophy. It would seem that the trope was of much more interest in art and literature than in philosophy. This article Noble savage - Wikipedia may help with that. Here's a passage that might interest you:-
In the philosophic debates of 17th-century Britain, the Inquiry
Concerning Virtue, or Merit was the Earl of Shaftesbury’s Ethical
response to the political philosophy of Leviathan (1651), in which
Thomas Hobbes defended absolute monarchy and justified centralized
government as necessary because the condition of Man in the apolitical
state of nature is a “war of all against all”, for which reason the
lives of men and women are “solitary, poor, nasty, brutish, and short”
without the political organization of people and resources. The
European Hobbes gave as example the American Indians as people living
in the bellicose state of nature that precedes tribes and clans
organizing into the societies that compose a civilization.[5]
The footnote takes you to a reference - Harrison, Ross. Locke, Hobbs, and Confusion's Masterpiece (Cambridge University Press, 2003), p. 70. If you have access to a good library you might like to track it down.
ADDED THE NEXT DAY
Out of sheer curiosity, I looked Hobbes up and searched for "America" in the text. The references are given below. I also checked on Locke's Essay and Second Treatise; I found three references in the former and no less than fifteen in the latter. Here are the references:-
Locke, An Essay Concerning Human Understanding:- 13, 20; 14, 20; 16, 6
The Second Treatise of Government:- 2, 14; 5, 27, 36, 37, 41, 43, 46, 48, 49; 7, 92; 8, 102, 105, 108; 16, 184,
An ancient, vague memory led me to look up his labour theory of value in Second Treatise chapter 5, esp. § 27. He doesn't mention America, but he is clearly thinking of a colonist in an unoccupied territory. So you might like to expand your range to include "state of nature".
HOBBES, Leviathan:-
10, § To Honour and Dishonour;
13, § The Incommodities Of Such A War;
20, § Objection Of Those That Say There Are No Principles Of Reason For Absolute Soveraignty;
46, § Private Interpretation Of Law