Looks like Pinterest has a variety of purposes for rose hips, the second link cautions readers about possible problems they can cause and medications they can interact with if taken internally. If you choose to ingest them, please consult your doctor before you do this to see if they would be safe for you. Best to you.
I think I saw some TV show, ages ago (a home-style programme) that was demonstrating how to use rose hips - make a jam.
If they are dried, infuse them in an oil to make a hot oil treatment. Or use the oil for soap or lotion https://www.yourbeautyblog.com/2018/04/how-to-make-hot-oil-treatment-for-hair.html