I've listened to a sound sample of Shirley Temple singing AT THE CODFISH BALL and it sounds to me like she's singing:

"Tunas trucking left and right...."

I don't know exactly what "trucking" means, but I assume it's some kind of dance step, as in " KEEP ON TRUCKIN', MAMA." (Of course, in the spirit of double-entendre, it can have more than one meaning, but I'm sure Shirley Temple's "handlers" wouldn't have allowed her to sing "trucking" unless it had a well-known innocent meaning.)