I don't think they would sell well.
"Organic fatty acids" is all you need to say. Marketing is a science, and art, and a great evil upon humanity.
It could be marketed as white laundry soap, but it would gradually make your white laundry browner and browner without you immediately noticing.
We could use it to scrub floors. You could walk on it every day.
If you collect the fat in a large pool, could it be considered free range?
If you can sell it as such, then yes.