Krill

 A naughty knave was known to crave for chocolate shrimps and danish.

He lurked beneath the boardwalk bent to bob for krill and vanish.

One day this Craving Craven Knave did cross a crab quite crusty.

He caught a killer claw before his gartered guts got gusty.

He crawled across the crafty currents cringing from crustaceans.

He swore he'd ner return to court the sea on his vacations.