He's used to feeling small. If there's one thing his father taught him, it is the feeling of insignificance.
But he usually doesn't have to look up to see the top of his boots. The slimy skin and warty knuckles are a change too. Zuko blinks one eye, then the other. Wait. That isn't normal either.
"Katara!" he yells. Or he tries to. Yelling doesn't quite work when his tongue shoots out and wraps all the way around his body.
"Zuko?" Familiar footsteps approach, then stop short.
He blinks sadly up at her.
"Oh, you have to be kidding me."
"And this," Katara says, holding him at eye level, "Is why I don't play Pai Sho with weird strangers."
Zuko gives a mournful croak and she strokes the tufts by his ears. Somehow, he looks even grumpier.
The Fire Lord is a badgerfrog. She's less surprised than she should be. Less upset too. She's heard of enough spirit transformations to know there isn't much danger. A kiss before midnight and Zuko will be back to normal. Until then—
She plops him into a basket. "Come on, Frog Lord. You needed a day off anyway. I'll change you back before supper."