Made mine by easily modifying a couple of farrier knives. Like a one handed draw knife. Very popular from about 10000 years ago till present. Great for bushcraft carving and such.
Have an assortment with different radius blades. Hans Karlsson from Sweden has a slightly different blade to handle junction. HK are available from the Maine Coast Craft School. Ben Orford in the UK use to, maybe still does has a few models of Mocotaugan or Indian Crook knife. Using the internal bevel, more trad model for a few years. Handle allows for two or single handed use. Del Stubbs up in northern MN (Pinewood Forge) makes a more traditional sloyd style hook blade. All 3 of favorite makers use different type of raw steel. All produce high quality blades that stay sharp with minimal maintenance. Tools that will outlive me. Not a crook knives, but handy for carving. Barr tools out of Idaho makes an inshave with a smaller radius (~2") that is handy for rapid and control removal to form a smooth concave surface. Mora makes a knife they call a "wood splitting" knife. Sort of like a spoke shaver, but beveled on both sides. Have an older Triflex steel model. JMHO, with the merger of Frost & Eriksson the knives have lost their quality. Would only consider their laminated steel models. Many alternatives at a better value. Realistically you really only need one straight blade, one hook knife, and one carving axe to carve anything. Additional tools just make life a bit more easy. Better to spend the $$s on the minimal tools needed vs. a tool roll of marginal quality tools.