Looking at "Chespiñata" again, I think it suffers a little from "Garbodor syndrome". Its artwork only depicts it in an incredibly derpy pose, showing it from the worst angle possible. It might look a little better in 3D. Perhaps its back is armoured, spiky or scaly? Perhaps it doesn't look as chubby when it moves? Actually, I doubt the latter, seeing as it doesn't have legs, only feet. Makes me wonder how they will animate it walking. Wagging from side to side?
Either way, I hope that the English name might provide some hints as to what we can expect from its final form. In the good ol' "Mr. XY" days, the proposed names were Chespin - Chespear - Chespike. I guess we'll find out in a few days.