It sort of 'exists', but it's more time consuming and slower that real feathers.

If you place those synthetic 'tailing fibers' into a dubbing loop, they make good hackle. Especially nice when you need longer fibers and want less bulk in them, or need very sparse hackle. You can easily 'size it', and it's very light.

Only time I've done it, however, was when I was away from home and 'forgot' real hackle. Worked just as well, though.

Buddy