What toy did Ed Headrick help modernize?

The Frisbee! It's also known as the flying disc or flying saucer. Headrick was also instrumental in the development of disc golf.

At the American toy company Wham-O Inc., after an inauspicious start, Headrick became head of research and development. There, he redesigned the Frisbee that was originally created by Walter Frederick Morrison.

Achievements of "Steady" Ed Headrick (1924-2002):

* Inventor of the sport of Disc Golf
* Inventor of the first disc golf basket, the Disc Pole Hole
* Designed and Installed the first Disc Golf course
* Inventor of the modern-day Frisbee
* Founded: The International Frisbee Association (IFA)
* Founded: Disc Golf Association (DGA)
* Founded: Professional Disc Golf Association (PDGA)
* Founded: Recreational Disc Golf Association (RDGA)
* Established and organized the first World Frisbee Championships and the Junior World Frisbee Championships.
* Established the first Disc Golf tournaments and a $50,000 landmark Frisbee Disc Golf Tournament in 1979.
* Donated his trademark “Disc Golf” to the public domain and his life to the sport he loved

https://en.wikipedia.org/wiki/Ed_Headrick