I don't actually know if all Pugs have curly tongues, but I think a lot of them do. Whenever Seymour yawns, which is quite often, I see this long curly tongue appear. It reminds me of fruit by the foot (anyone remember that stuff?).
So I did some research on the internet and below are my findings regarding pug tongue curls:

Bath curl

side curl

outdoor curl

Droopy curl
fancy curl