Yes, I believe it is. If not affecting their health, then it would at least be unpleasant for them. Some of the scented rolls are very strong in perfume.
I only use hypoallergenic rolls for the herps. Sorbent do a completely unscented hypoallergenic item but I reckon that some of those 100% recycled, unbleached 'natural' ones are totally unscented as well (but my partner refuses to use them, as they're not soft enough.)