I’ve Never Heard a Monshter Lishp

Another attempt at an Ogden Nash-type poem.
In the 3rd line, “menashe” means “menace.”
A lishp is shometimesh hard to undershtand.

I’ve never heard a monshter lishp;
Their shnarlsh are alwaysh loud and crishp
And, when they bite, they’re quite a menashe.
I guessh they never shcare the dentisht.