Smelly on wheels

The Garotid Artery {Arrow in archery target}

"ARTERIES AND ARTICHOKES – A VEGETARIAN COOKBOOK FOR CANNIBALS"
{author's name heavily crossed out} (nice mess)
by Paul D. Arthurwan.

{A large spotty frog crouches in the corner of the page, thinking the word MEGATHERIUM. The frog is labelled [Green].}

Stinkig
Smelly
Fetora
Odoreux

Good evening.
Here is the word SMELLY.

{It's written on the side of a trolley, from which an arrow points right, suggesting movement.}

{Now the word itself has wheels, and is hurtling down a hill towards a deep pit containing "R. Maxwell (dead)" and a substance that emits the words PONG, NIFF, WHIFF, POO and STINKY.}

Pong --> pong --> stinky --> stinkier --> stinkiest. Thank you.