no
The question might presume a fact not in evidence: fiddler crabs are not chordates (phylum chordata, with internal skeletons) but instead are phylum arthropoda, characterized by segmented bodies, an exoskeleton made from chitin, and joint appendages.
by rubbing their big claw on there body
Ghost crabs? Well that depense if it is a dead fiddler crab so it would be the same/
yes they are
== == == ==
?
no they are not
They're in the crustation or the crabs group.
crabs are nocturnal
No, Hermit Crabs and Fiddler Crabs are very different, and require two whole different living conditions. And Fiddler Crabs are very aggressive, and will probably attack the Hermit Crab anyway. So, in all, it just isn't a good idea.
you kill the fiddler crab
fiddler crabs drink fresh water.