… or equivalent: What is Miss Piggy’s first name?
Pigathia
What is Miss Piggy’s last name?
Lee (as in Piggy Lee)
What is Kermit’s last name?
the Frog
Spoiled by mouse-over.
But you didn’t have to Google, right? 
Funny enough, the only one I knew (Kermit) was the only one not spoiled.
I don’t think I’ve ever heard any of those before. Except the last one, but never as a fact as I would have said his name was Kermit.
Also acceptable answers:
the Gorf
the Forg
the Grof.
Seems to me his last name would be Frog.
Yeah, his last name is frog, and “the” is his middle name
Well, Lew Zealand (he of the boomerang fish act) use to call him “Mr. The Frog”.
Well that’s frickin’ useless, isn’t it! Will need to adjust in future.
Place extra brackets around your answer. Things in brackets don’t show up in spoilers. I’d probably put them on the inside of the spoilers…
[…like this.]