This is a question in the series of Enchantment Benefits for Humans, the successor of Would Rubberizing Benefit People and If So, How?.
When an item kills a Chomper (you can see link one or link two for more on Chompers), that item is Calcified; it becomes harder but also tougher, capable of taking more force without shattering than another item with equivalent hardness. The durability (hardness and toughness) increase is equivalent to the hardness of enamel as compared to bone, which means a Calcified sword will be as hard compared to a regular sword as enamel is compared to bone.
That isn't to say Calcified items are more brittle; while they have enamel-like hardness, their flexibility and durability is akin to that of bone. Basically, Calcify an item and it becomes a whole lot more durable. This is great for adventurers, who of course hate it when their stuff breaks, but would it be good for creatures who kill Chompers, like humans?
Restated, my question is Would Calcification Benefit People And If So, How?
Calcification increases the hardness and toughness of an item or creature but does not make it heavier or slower.
If someone somehow has the strength to crush a Chomper with their bare hands or feet, that would Calcify only that portion of their body. If someone swallowed a Chomper (which is basically impossible without shrinking them first), that would spread the Calcification throughout their body, making the end result weaker. If someone kills or consumes twelve Chompers, however, the result is much more dramatic.
"Bonies," or skellies as they are sometimes called, have thick, shiny, and very hard skin. They are real-life ironhides, with bones like stone and muscles like steel cables. If that doesn't make sense, imagine a statue of a buff human being covered with a 2-in. thick layer of cast iron, except they can not only move but move just as quickly as a regular person, and they aren't even heavier.
A skelly is not just physically fit but incredibly strong, capable of lifting (and throwing) a small car. Their defenses are also pretty dangerous; bone can bend, and a skelly's body has that same flexibility. They are still prone to snapping and breaking, but not as much as you'd expect of someone practically made of rock. Obviously, a skelly's body acts normally aside from the above facts; for example, despite their skin's hardness, it is still flexible and does not warp, creak, or strain when they move.
EDIT: Calcification is not meant to be taken literally any more than Rubberization. Calcification makes people inflexible, yes, it makes it harder for parts of their body to bend when stressed, but it also makes them tougher to balance that. (In other words, skellie's bones have breaking points proportional to their increased hardness.) Think of stone; it may not bend, but it's not known for being easy to break or destroy, it's known for the opposite.
Besides, there are plenty of inflexible people in today's age who can't touch their toes and find stretches difficult and painful and are still relatively successful; I'm one of them! So yes, Calcified people can be shattered or deformed, but they're really not as weak as the answers seem to suggest, and they can heal.