Jo-jos are a common deli food in the Pacific Northwest, and I have not often seen them outside of that area. Sometimes they are referred to the much less catchy appelation savory potato wedges.
To describe a jo-ho as an overgrown french fry is somewhat accurate, but does not do full justice to the taste and texture of a jo-jo. For one thing, they are usually not salted and crispy as a french fry, giving the jo-jo a much more moist, chewy texture. Also, each they are usually spiced in a particular, jo-joey way.
Some jo-jo's are recognizable as a potato wedge that has been fried. Sometimes, when I am eating a jo-jo, especially one from Fred Meyer, I get the feeling that it is just a lump of potato products lumped together into a jo-jo shape.
Personally, as a vegetarian, I find jo-jos to be the best way to get my dose of greasy, spicy, deli food.
The residents of Vancouver, Washington, are known to have a special fondness for jo-jos.