Some wood scrapers. Bottom is a hand held scraper, which is held to the wood at a slight angle, away, and with the thumbs pushing slightly in the center, to bow the scraper. Middle right is a scraper, that does all of the angling and bowing for you. Top is a stencil scraper, designed for removing stenciled shipping labels from wooden shipping boxes.
Some other methods of scraping wood include using broken glass as the tool, or razor blades, and even sharp knives can scrape the surface when held perpendicular to the work, or slightly angled. The wood is removed as shavings, much as if a plane was used.
The scratch stock is probably very ancient, as a tool, and is exceptionally versatile . If I need only a few feet of molding, I can grind a new cutter in minutes, sharpen, and be cutting wood very quickly.
My scratch stock, with a few of it's cutters, and the small, round file used for the sharpening. I've recently added an additional fence, to increase stability.
The added fence has increased control, and reduced the "ripple" effect common to working with a scratch stock. The ripple is caused by alternating bands of hard and soft wood. Light pressure on the cutter with heavy pressure on the fence will control ripple, and gesso and sanding reconciles a multitude of sins.
Scratch stocks, here, here, are sharpened in a similar way to the regular scraper. I sharpen my cutters by using the small round file, at a slight angle away from the cutter. A few strokes, on both sides, produces a "burr" that shaves the wood.