Real brain power on display. Thanks for that ansewr!
Due to the facts that Wanda had to retrieve the body of Manpower Erf-b1-p3 and that she later said that Ossomer had to be captured (rather than be croaked and dragged over to her hex afterwardsErf-b2-p6) it is possible that moving a dead body from hex to hex causes it to be impossible to uncroak/decrypt.
It is likely that constructed units, such as golems, cannot be uncroaked.
With the Arkenpliers, Wanda is able to Decrypt units - to bring back the dead with all their abilities and most of their memories intact, but loyal to the caster and her side. Many casters believe this takes Croakamancy into the realm of Life magic, which is normally its antithesis. Many casters find this to be unnatural, and thus, wrong.