The Not-So Scary Snorklum

Over the hill stomps a huge, hungry Snorklum, who thinks he might have a Mole sandwich for tea with a little salt and pepper and chunky pickle. But the Snorklum is scared of something too. Why do his knees knock, his tail twitch, and his whiskers wibble in a worried sort of way? And why is he in such a hurry?