Slime mold

Slime mold is the default name for NetHack's customisable fruit. You can change it, with the fruit option, to anything you like. You could choose slice of pizza or bowl of gruel or leg of ham and the game will identify pizza, gruel and ham as the food part, giving messages such as "This tastes like ham juice" when quaffing certain potions.

The name you choose has no impact on gameplay.

If you leave a bones file with any custom fruit in it, the name will be preserved for the player who finds it. Thus it is possible to have several different pieces of customised fruit in one game.