Ольга1987
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Actually, I don't have many nicknames for creatures.
Champions - knights/cavalry/horses;
Unicorns - also horses;
Elves - pointy-ears;
Dendroids (any) - ents;
Zombies (any) - slowpokes;
Death Knights - Nazgûl;
Vampire - Dracula;
Cerberuses/Hellhounds - dog(gies);
Gorgons - cows;
Lizardmen - lizard-idiots));
Ancient Behemoth - mammoth poop (because it's ancient...);
Dragons (any) - dragonlings (though I sometimes call dragons from the Fortress "Chinese" - IMHO, they resemble them).
Heroes 2:
Pigs - oinkers/piglets;
Nomads - Bedouins.
A secondary hero, transporting reinforcements to the main hero or collecting resources/placing flags over mines - a pushover.