Hermit crabs are omnivorous scavengers in the wild. There are lots of different foods that a hermit crab can eat. We have several different food lists for commonly fed items. Check out a few of the atypical things that hermit crabs can eat:

Feces – herbivorous animal droppings. In Quirimba hermit crabs are known to eat human waste as well.
Fish flakes or pellets
Bloodworms
Mealworms
Earthworms
Cuttlebone – great source of calcium
Bonemeal – great source of calcium
Cicadas and their exoskeletons (most other bugs too)
Worm castings
Greensand

Cicada exoskeletons

Compressus eating guinea pig feces by Stacy Griffith