"The hard-shelled claw of a vicious Crabby."
The Crabby Claw is an item that can be obtain from Crabby.
There is a quest by talking to a fisherman at Seaside Path. Completing that quest with 30 Crabby Claw will rewarded you including Fresh Fish.
These claws can be traded to the Fisherman after doing the quest at a rate of 10 Crabby Claws for 5 Fresh Fish, which would make Crabby Claws worth 40 Copper Coins.