κέρκα

The word hardly belongs to κέρκος (kérkos, “tail”), as per Frisk. The word is rather Pre-Greek.

κέρκα • (kérka)

1. Hesychius gives the definition as: ἀκρίς (akrís, “grasshopper, locust”).

• “κέρκα”, in Liddell & Scott (1940) A Greek–English Lexicon, Oxford: Clarendon Press
• Beekes, Robert S. P. (2010) Etymological Dictionary of Greek (Leiden Indo-European Etymological Dictionary Series; 10), with the assistance of Lucien van Beek, Leiden, Boston: Brill, →ISBN
• Hesychius' Lexicon: κ