Use the command(s):
c_spawn("molehill", #) To spawn a Burrow under you mouse cursor.
c_spawn("mole", #) To spawn a Moleworm under your mouse cursor.
c_give("mole", #) To spawn a Moleworm in your inventory.
Replace the # with the number of the item you want to spawn (E.G, c_spawn("mole", 1) or c_spawn("mole", 9999999)