Can you get stung by a dead jellyfish?
Jellyfish
can sting with their tentacles if they brush against you when you're
swimming in the ocean. You also can get stung if you step on a
jellyfish, even a dead one. Usually, jellyfish stings will hurt, but are
not emergencies.
Source : http://m.kidshealth.org/en/kids/jellyfish.html