Traffic jams test me, toddlers lack me. What am I?

Melodious metal beasts roam the streets, luring children with sweet melodies and frozen delights, a summertime symphony on wheels.

You learn this as a toddler, but some say you should even learn to do this before you crawl.

This riddle is one more on my belt. Give up, you'll have been taken down one. Get it on, you can put one in your bedpost.

When I try to solve a riddle, I throw everything I have at it: my brains, chickens, shadows, dreams, time, stars, and this thing from the kitchen as well