Well yes, but we're talking about doubling units. Doubling a corpse just gets you another corpse, which isn't very useful.
And now I wonder what a Trimancy link up between a Croakamancer and Dittomancer can do.
"They couldn't know that the points from the mainline to the siding were frozen, and the signal should have been set at 'DANGER', but snow had forced it down."
- The Flying Kipper