Sir Fartsalot Hunts the Booger by Kevin Bolger, Stephen Gilpin

When the brave and bold Sir Fartsalot begins his quest to rid the world of the Foul West Wind, prankster Prince Harry convinces the dashing knight that a dangerous creature called The Booger is the source of the smell that inspires his new friend to go on a wild adventure to find the elusive and stinky beast.