Possible Clues:

• 'Fee, fi, fo, ___'
• "Fee, fi, fo, ___"
• Giant word
• Giant sound
• "Fee, fi, fo, —"
• 'Fee, fi, fo, --!'
• Big fairy tale character word
• Giant syllable
• "Jack and the Beanstalk" syllable
• "Fee, fi, fo, ___!"