Can I use bio oil for freckles and scars?

It won't work. It's a health fraud. It won't touch scars. It won't remove freckles. If you use a freckle remover, even from a dermatologist, you risk disfiguring yourself. Freckles are endearing, they're distinctively you, and a majority of your friends probably like them. Ask them. If you want them less prominent, avoid excess sunlight -- wise in any case.