Prune is not a native fruit so there is no telugu word for it. So you may call it
Prune only.
If somebody is referring to prawns then these are called Royyalu in Telugu.
Is sorbitol naturally in Prunes Which fruits contain sorbitol?
I am allergic to Sorbitol. I just did some research online, and these fruits contain sorbitol:
1. Apples
2. Pears
3. Peaches
4. Prunes
And one gum that i know doesn't have Sorbitol is Ice Cubes (Ice Breakers Gum).
Are prunes and canned baked beans considered as roughage food?
Yes. Roughage is the same thing as fiber. Both baked beans (or any kind of beans, really) and prunes (as well as most fruits and vegetables) contain fiber.