1. Different shapes: The stems of crisp yam are much thicker than those of iron yam, and the hairs on the surface are obvious. Even after peeling, there will naturally be small black spots inside. The iron stick yam is thin and long overall, with less obvious hairs, and the inner stem will be whiter after peeling.

2. The eating texture is different: Crispy yam is mostly used for frying to make dishes, which makes it crisper when eaten, while iron-bar yam is mostly used for stewing soup, which has a dense texture.

3. Different skins: It should be noted that from the skin of crispy yam and iron-stick yam, the skin of crispy yam will be smoother and has no hairs on the surface, while the skin of iron-stick yam will be rough and the surface will be rough. The whiskers are denser.

Reference for the above content? Baidu Encyclopedia-Yam