“You're a vile one, Mr. Grinch.
You have termites in your smile,
You have all the tender sweetness of a seasick crocodile,
Mr Grinch.
Given the choice between the two of you,
I'd take the seasick crocodile”

Grinch – Your A Mean One Mr Grinch Lyrics on LyricsMode
Vile person with hollow rotting words. And as for the crocodile which has a sneaky nasty disposition because they do not want to cuddle but consume. But the person making the comparison would find the crocodile more compassionate.