The sailors all laugh at Squall as he tries to nobly impart his story.
"Feh," says Master Scourge. "You look like somebody upended a vegetarian dish all over you." (gets some laughs)
"Kale!" "Iceberg!" "Chard!" "Tossed Salad!"
And that is how Squall's name came to be Tossed Salad.