Possible Clues:

• Slimy amphibious types croak, in not entirely good health?
• People pleasers
• Two bad drivers regularly ignored crawlers
• Brown-nosers
• Mice regularly trapped by animals — those having brown noses?
• Apple-polishers
• Grovelling lot offering foreign aid in lower digits
• They suck up liquid iodates
• They bring sycophancy to a day in Ancient Rome
• Kowtowers