Tom, the OP means the enemies effigies, the moving ones, not the effigies we see in Prophecies.
As for the OP's question, we don't know - they were introduced in EN, and there's no show of them being used before hand (the only way we would know would be added quests to Prophecies, and Saul's Story/Gwen's Story - the former doesn't exist and the later just has Charr Hunter Beasts). It is possible, but still unknown.
I think they are just a Shaman Caste thing, though this may have changed in the 250 years, as we see them in the second GW2 trailer (though they could be an enemy of the three legions as well).
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