Usually the ones I see in the crackhouse etc are "crackheads", but I'm fairly sure I just saw a "Crack Head" in the CCS. And yes, it seems to exist in the source as well...
From creaturetypes.cpp, line 1610 onwards...
case CREATURE_CRACKHEAD:
strcpy(cr.name,"Crack Head");
GIVE_WEAPON_CIVILIAN;
if(!LCSrandom(5))
{
Weapon w=Weapon(*weapontype[getweapontype("WEAPON_KNIFE")]);
cr.give_weapon(w,NULL);
}
armor=new Armor(*armortype[getarmortype("ARMOR_CLOTHES")]);
cr.give_armor(*armor,NULL);
cr.money=LCSrandom(31)+20;
cr.juice=-20;
if(cr.align==-1)
cr.align=LCSrandom(2);
cr.age=AGE_YOUNGADULT;
attcap[ATTRIBUTE_INTELLIGENCE]=1;
attcap[ATTRIBUTE_HEALTH]=1+LCSrandom(5);
attnum-=10;
break;