croar is the infinitive form of the verb for what a frog says in spanish.
espalda means back (the body part). Dedos are fingers.
I don’t think people in the 50s really rocked around the clock. I think they just rocked until 2 in the morning and then said they rocked around the clock. Now everyone feels bad about themselves because they don’t rock until broad daylight. But it was always an impossible standard based on a lie.