Why asking worldbuilding when nature has already done it? ;-)

Let me introduce you the armadillo lizard!

The armadillo girdled lizard possesses an uncommon antipredator adaptation, in which it takes its tail in its mouth and rolls into a ball when frightened. In this shape, it is protected from predators by the thick, squarish scales along its back and the spines on its tail. This behavior, which resembles that of the mammalian armadillo, gives it its English common names.

Keeping in mind that we have birds hitting a tree trunk with their head without getting concussions, I think it's surely possible for a rolling lizard to develop tolerance to rolling.

Why asking worldbuilding when nature has already done it? ;-)

Let me introduce you the armadillo lizard!

The armadillo girdled lizard possesses an uncommon antipredator adaptation, in which it takes its tail in its mouth and rolls into a ball when frightened. In this shape, it is protected from predators by the thick, squarish scales along its back and the spines on its tail. This behavior, which resembles that of the mammalian armadillo, gives it its English common names.

Keeping in mind that we have birds hitting a tree trunk with their head without getting concussions, I think it's surely possible for a rolling lizard to develop tolerance to rolling.

A possible mechanism would be to "clamp" the labyrinth while rolling, so that inner flow cannot occur and thus spatial disorientation is not present once it stops.