Most pokemon don't show fur, but through the generations we have established that we are just meant to accept that they do have it. (Probably laziness on their part)
Yes, chespin has spikes.. on it head.
The Grass-type Pokémon Chespin has a tough shell covering its head and back. Despite having a curious nature that tends to get it in trouble, Chespin keeps an optimistic outlook and doesn't worry about small details. <-- That is all that was on Chespin on the Pokemon website, no mention of spikes though?
Chespin, the Chestnut Pokemon, is covered by a hard shell on its head and back that it uses to protect itself from attacks. It is able to make the spikes on its head shell sharper by focusing its energy. It knows Tackle, Growl, Vine Whip, and Rollout. <--- From Corocoro(?) and only mention them on the head.