Crunchy mutfruit

 is a food item found in Fallout 3. It can restore some of your hit points, but also gives you a small amount of radiation.

Crunchy mutfruit has a different appearance than the standard mutfruit, with the word "crunchy" perhaps being a pleasant euphemism for "rotten".

Locations
Crunchy mutfruits are fairly common, and can be found at any of a number of camps and other dwellings. Guaranteed locations include:
 * On a table in Billy Creel's House (Megaton).
 * Caravan traders (specifically, Doc Hoff).
 * Gary's Galley.
 * From the repeatable quest Zip's Nuka Fix.