Friends&Foes adds a crab - perhaps this could Crabbers Delight could either depend on this for the Crab entity or at least make Friends&Foes crabs drop claws and such?

The crab from Friends&Foes already has its own Crab Claw that drops from the Crab.

However, I think it could be done via loot modifiers so that Friends&Foes' crab also drops crab food item from Crabber's Delight.