The energy is chemical energy. To measure this the item could be burned in a calorimeter. Also if the peanut is sitting on a table it could have kinetic potential energy due to gravity if it fell off the table.
Not really. While electrical and magnetic fields can cause objects to move and be deflected, there is no such thing as a force field, except in movies.
Energy in all foods comes from calories, which are in starches, fats and proteins. Peanuts contain a high percentage of fat, which is the source of most of their calories, or energy.
That is called potential energy. It can be gravitational as in a body raised above the earth's surface, or chemical as in fossil fuels, or nuclear as in uranium. It means the energy is there in the...