御猪口[ochoko] small cup
片口鰯[katakuchiiwashi] Japanese anchovy (Engraulis japonica)
白口[shiroguchi] white croaker (Pennahia argentata)
悪たれ口[akutareguchi] abuse
悪口雑言[akkouzougon] all kinds of malicious gossip

異口同音[ikudouon] in concert
異口同音に[ikudouonni] in one voice
ひと口[hitokuchi] mouthful
一口商い[hitokuchiakinai] an immediate definite deal
一口同音[ikkudouon] reading in unison

蝦蟇[gama] toad (esp. the Japanese toad, Bufo japonicus)
蟇股[kaerumata] curved wooden support on top of the main beam of a house, now mainly decorative (shape evocates an open-legged frog)
蟇口[gamaguchi] purse with a metal clasp
大蟇[oohikigaeru] cane toad
ヨーロッパ蟇[yooroppahikigaeru] common toad (Bufo bufo)

宮古蟇[miyakohikigaeru] Miyako toad (Bufo gargarizans miyakonis, a subspecies of the Asiatic toad endemic to the Ryukyu Islands)
アジア蟇[ajiahikigaeru] Asiatic toad (Bufo gargarizans)
谷蟇[taniguku] Japanese toad (Bufo japonicus)
蝦蟇鮟鱇[gamaankou] toadfish (any fish of family Batrachoididae, esp. the Pacuma toadfish, Batrachoides surinamensis)
蟇目[hikime] large, perforated, turnip-shaped arrowhead cover made of Japanese bigleaf magnolia or paulownia