Possible Clues:

• Henson's troupe
• Rowlf the Dog and Robin the Frog, for two
• Having a lead, stops 1,000 dogs, say, getting nits
• Idiots upset MP in reshuffle
• 'Sesame Street' cast
• Kermit and company
• Animal and Scooter, e.g.
• 'Sesame Street' group
• What 17-Across and 9-, 11-, 26- and 50-Down all are
• Henson characters