1) potato bug

2) roach

Cockroaches in your gourmet dinner? Maybe not as a main dish, but they have been used in sauces, condiments and as appetizers.
Don't complain next time you have to swallow cough syrup. You could be taking a dose of cockroaches instead! Processed cockroaches have been used to cure illnesses and physical disorders for centuries.
More cockroach tea, anyone? Brewed from cockroaches, this tea has been used to treat dropsy--a kind of sickness or inflammation.
Next time you have trouble going pee, and your urinary tract just doesn't want to go with the flow, why not try dried and powdered Oriental cockroaches? They are said to make a dandy diuretic.
Eat too much pizza? Cotton candy? Thanksgiving dinner? Some people eat cockroaches fried in oil and garlic as a cure for indigestion.
3) maggots
That's pretty much the ones that gross me out the most.
What about you?
I had no idea about maggots...
Maggots are also used occasionally in the field of medicine, as are leeches. Maggots are used to eat dead tissue, helping to clean open wounds.
During the Civil War in the United States, and World War I, battlefield physicians saw that soldiers' wounds that were infested with maggots tended to heal better than non-infested wounds. Soon 'maggot therapy' was being used to clean festering and foul-smelling wounds. Maggots not only eat the rotten flesh, they also get rid of harmful bacteria in the wound.
More than 200 hospitals in the U.S. and Europe have prescribed maggots of the Blowfly to treat patients with infections from injuries like pressure ulcers ("bed sores"), leg and foot ulcers, stab wounds, and post-surgical wounds that won't heal properly
