This is Changeling Applejack. (Appleling? Changelingjack? idk)
I saw the last episode of the second season of MLP, and I loved those insectoids. So, of course, I created changeling variants of the mane 6 in my head, and this is one of the sketches.
Changeling Applejack is what I call a "Tunneler" Changeling (as I have separated changelings into three groups, much like Pony races)
Tunneler traits often involve using the hind legs to buck the tunnel walls, break through, and create passages. Rather than flat feet, they have shovel like pieces of carapace. On their back is a set of layers to protect against cave ins and falling things in general.