Sokka was somehow turned into a catboy, and it wears off in 2 days. He has fluffy cat ears and a fluffy tail, but Sokka was still a human. And he can talk normally.

Sokka was wearing a blue jumpsuit, a purple belt, whose hair was half up half down. He had a small ponytail on the middle of his head and brown shoes. "Hmph.." Aang was on Appa, laughing. Katara was sitting by toph talking to her.*