kero & koro (colgen kowa)

ケロちゃん (Kero-chan) and コロちゃん (Koro-chan)

Mascot characters of コルゲンコーワ (Colgen Kowa), a cold remedy brand of Kowa Company, Limited. (Danbooru romanization: Kouwa Company) Aka. コーワのカエル (Kowa's Frogs).
Kero-chan is a girl frog, and Koro-chan is a boy frog. You can find their statues at almost every Japanese pharmacy front.

Their names are often mistaken for Keroyon or Kerorin_(brand). (Keroyon is a TV character, inspired by Mr.Toad, a character from Kenneth Grahame's The Wind in the Willows. Kerorin is a headache medicine brand of NAIGAI yakuhin Company, Limited, well-known for advertising media called 'Kerorin wash basins.')

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