Possible Clues:

• Boone nickname
• Twain's jumping frog
• Pioneer Boone, folksily
• Pioneer Boone, briefly
• Frontiersman Boone, familiarly
• Pioneer Boone, familiarly
• ___ Webster (Twain's 'celebrated jumping frog')
• Boone, to his buds
• How Boone carved his name
• Twain's 'celebrated jumping frog'