the feces of an orc can be referred to as 'feces orc'.
It is worth 80 copper, and is of the 25th level of power.
It is a trap ingredient.
It is made of burlap and weighs 0 pounds 15 ounces.


grenade feces
You step out of the shadows.
You produce a small grenade-like vial.



The feces of an orc is not a proper ingredient.
Your grenade is ruined.

Looking at the code is appears that this ingredient is made to be used with something other than grenade-making.

I would assume the appropriate text is the following in the helpfile -

Thieves can create a grenade from an ingredient. These ingredients are often the same ones used in making poisons or the same ingredients other thieves use to make *DAMAGE TRAPS*. Once a grenade is made, it can then be LAUNCHed at an enemy.


I would assume orc feces is for some other form of trap.

I think he implies that feces grenade should exist :)