I would lean towards it being a debitage / reduction flake as well, as opposed to being an intentionally formed thumbnail scraper. From the photos it looks like there wasn't really any work done to this small flake after it was removed from the core. I only see one potential chip on this piece that may have been intentionally placed there to produce a sharper edge on it. This piece may have been sharp enough for them to use as a scraper, just as it came off the main core, but it does not have all the final pressure flakes removed it, that we like to see on the stereotypical small thumb scrapers. HH