Frozen rice ???..........I don't think I've ever come across it.
I would think it could be a bit iffy to eat because it would have been partially cooked or blanched first. It is a fact that re heated rice encourages the growth of bacteria which can cause a form of food poisoning. Asians regularly re heat rice and get away with it because over generations they have developed an enzyme in their gut that can handle the bacteria in re heated rice, Westerners have no such enzyme in the gut and therefore are prone to illness from re cooked rice.
Tony.... On yer bike !! Curry with rice pud .....
Never !!