According to Ohio Flint Types written by Robert Converse these all are one or the rarest Flint Tools found in Ohio. They are attributed to the Early Arcahic Culture because of the materials used in their manufacture which coincides with materials used on other Early Archaic types.
These very unusual Tools are almost always made on a Uniface Blade, but some are also made from damaged or exhausted Points. The scraping surface is always concave and beveled away from the flat side. The stem is usually ground and are almost always one of two types, either a Side Notch variety or a Stemmed type which is usually slightly concave. There is rarely any secondary chipping other than around the stem and the scraping edge. The scraping edge is almost always on the right side when the flat side is down and very few examples are found with a left hand edge.
Sizes usually range at 2 to 3 inches in lentgh.
References: Ohio Flint Types by Robert Converse. Published by The Ohio Archaeological Society, 1994, Pages 60 and 61.
Some examples from my collection.