SmallchangerainIt isn't coated so I don't see why not. I don't have this Keith set but I regularly use my Snow Peak titanium bowl and plate as frying pans when I go camping, with pot lifters as handles.
SmallchangerainI would not want to cook with these--not back country, anyway, where fuel is at a bit of a premium. Titanium conducts heat miserably, which means you have to dump a lot of fuel into your stove before the heat will make it through to whatever it is you're cooking.
On the upside, this same property makes them great for use as actual bowls. They don't absorb heat from the food and shed it the way aluminum does. Your oatmeal won't be cold when you get to the bottom.
GeckoDeLimonIn my experience the added thinness of titanium is such that the reduction in thermal conductivity offered by titanium is completely offset. The thinness makes it very hard to fry on with a small burner(hot/cold spots) but makes for excellent water boiling. Also the bowls get hot and cold very fast. Much like tinfoil is not able to hold any heat for more than a fraction of a second.