On the basis that I have a young child and should know these things, I was recently asked if there was a nursery rhyme for the BGG. I thought not and said it was just a story.
They all want to cross the bridge. The troll doesn't let baby. The troll doesn't let mummy. The troll tries not to let daddy but daddy butts him off the bridge. They all cross and eat the sweeter grass.
Now I think I'm wrong.
Isn't there a song?
"I'm a Troll, foll-dee-roll, and I'll eat you for my supper!"