Not really, wheat germ has a different flavor and texture than white wheat flour. If only a small amount is called for some whole wheat flour may work.
Germ is not the same as gluten, but it contains gluten. In any case, wheat products, even if handled carefully, are almost guaranteed to have gluten in them due to cross-contamination.
No. Wheat germ is a specific part of the wheat grain, containing oil and other nutrients, without the starch of the rest of the grain. Flour is the starchy part of the grain with bran and germ...