Heh. My brother's wife was starting to look like an Oompa Loompa because of her carrot snacking habit. It was pretty funny, though it doesn't seem to have had any deleterious effect on her health.
In most parts of the US a sweet potato with soft orange insides is correctly called a "Yam" to differentiate it from the sweet potatoes with firm yellow insides.
Either name isn't great; it's neither closely related to the african yam, nor the common potato.