Thankfully, Dragon words don't need the "-er" part of crusher in them to mean the same thing. You can use another word instead and enhance the name, like these.

Qeth = bone, kren = crush/break, tu = hammer

Qethkrentu = "Bone, break, hammer"

Krenqethtu = "Break, bone, hammer"

Tukrenqeth = "Hammer, break, bone"

Tuqethkren = "Hammer, bone, break"

I personally like "Qethkrentu"  the best, but the choice is yours!