Related Clues:

• Another mild expletive
• Willard's pals
• Blast alternative?
• 'Crud!'
• Exclamation of frustration
• "That didn't go well"
• 'Foiled!'
• Fudge alternative
• 'Bummer!'
• Rodent pests
• Ne'er-do-wells
• "Oh, criminy!"
• 'Dash it all!'
• Blows the whistle
• Lab rodents