That is tricky. I don't believe any research has been done on flours and hedgehogs. The variety of flours that do not contain wheat is growing rapidly, at least in America. This is because some people can't handle gluten, the protein in wheat and some other grains. It's also become a fad diet, and according to some will cure just about everything that ails you.
Now, that being said, I'll pull information from other areas. When a human baby is starting their first solid foods, they eat easily digestible grains. Baby cereal is generally oatmeal, rice cereal and there may be some others but those are the main ones I can recall.
So if you have access to rice or oat flour, I'd imagine they would possibly be preferable over any wheat flour.