Is a standard troll like a standard metre?
Tried his best and couldnee muster
A theory of rotation that wasnee flawed
So they put him back in the bottom drawer
And waited a couple of hundred years
Then dragged him out to express his fears
That his original troll had been half mast
But he'd been soundly beaten from first to last
For marks he's not worth that 3 out of ten
He was more like a flatfish when we'd finished with him.

With apologies to trolls, pedants and poets everywhere

Chris.B