Possible Clues:

• Thin Mints seller
• Thin Mints seller (Letters 7-9 + ...)
• Seller of Caramel deLites
• Brownie, for one (2 words)
• Cookie Business badge earner
• Seller of Thin Mints
• Samoa salesperson
• Brownie with cookies, e.g.?
• Brownie, e.g
• Young cookie vendor