Did you see the link in my first post? I think some Amerindians worked on plantations. See the section on "Invasions of Guyana"
Very few worked on the plantations. The vast majority fled the plantation regions to avoid slavery or is counterpart, and many also died of European diseases.
Why do you think that the planters went to the expense of buying enslaved people from Africa, in Guyana's case, even more expensive as they had to be bought via Suriname or Curacao, with the additional mark up.
A question was asked about why Amerindians don't live in the settled parts of the coast. I gave an answer. Amerindians live in the Pomeroon region and not on the Essequibo Coast itself. Where ever plantations existed Amerindians had no interest of being.