The very first one is a kind of puff pastry/crumbling pastry ... "cake" from Beijing. I guess it's more like shortbread. Usually baked, with a glaze on top.
The second one (opague, white wrapper) are crackers as that's what the 2 words on the bottom right, on the front says. Made of wheat flour, milk powder, salt, "food addtives". The rest I have no idea what they are.
The third one is some "sesame flavoured"... jobbie which, again, has a starchy layer that wraps around the stuffing. Looks to me the starchy bit should be a bit soft & sticky & slightly chewy. Another Beijinese thing.
If ever anyone is in that neck of woods, try Mongolian jerky. Tough as leather but tastes absolutely great.