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From the third game:
Evil Eyes - evil little eyes
Gorgons - chicks
Wyverns - vevirns
Monsters - bibizyan
Spearmen - kopeecheniki
Archdevils - yum-yums (they beckon with their finger)
Gnomes - grandpas
Gog - Givi
Earth Elementals - poop
Zmei - strekozec, strekozel
Dendroids - firewood
Azure Dragons - gay-berry (blueberry)
From the fifth game:
Gremlins - pyrotechnicians
Golems - ainanane or gypsies (they shrug their shoulders when looked at closely)
Paoka - paokashki
Twilight Witches - aunties
Swordsmen - tin cans
Skeletons - kostyashki
Paladins - alladins
Dancing with Death - girls (when they are hit, they scream like girls)
Druids - akkamada (or how they scream at the end of the battle)
Hero names:
Letos - Lexus
Vaishan - Ravshan
Zeheer - Zephyr
Talarnar - Tolya
Faydaen - Fedya
Sinithar - Sanitary