Hippocampus
The hippocampus is a Greek sea-horse. The name is curious, so it’s likely a pun with Greek επικομπεω epikompeo for “boasting”. The giveaway is that these critters draw the chariot of Poseidon, who is a pun with “lying” & “cheating”.
To form a sea-horse, the ancient storytellers should simply have added a word for “sea” or “fish” to the horse. Instead they chose to to marry the horse with a kampos, which is some rare term for an unknown sea monster. It’s likely some serpent or a snaky fish, because the word root is associated with “twisting” & “bending”. This easily leads to some spooky pun, which explains the odd choice.