The word "ball-shaped" is correct and usable in written English.
You can use it anytime you need to describe something that is shaped like a ball - for example: "This rock was ball-shaped and smooth to the touch."
One of these stones was ball-shaped while the other was perforated and may have been a mace or club.
The bag should be roughly ball-shaped.
Falafel is typically ball-shaped, but is sometimes made in other shapes, particularly donut-shaped.
Flat lollipops are safer than ball-shaped suckers.
See those big ball-shaped foliage things on the lawn?
Ball-shaped ones, frequently made of metal, are known as pomanders.
For their efforts, Kvitova and Berdych were each awarded a tennis-ball shaped trophy encrusted with 250 diamonds.
Sturridge ran on to the ball, shaped his body and side-footed his shot past the oncoming goalkeeper, Alan Marriott.
The company started shipping an (almost) golf ball shaped USB mouse along with a mat resembling a green.
Besides the larger objects there are also seen several small ball shaped objects in Fig. 7 (alerted by arrows).
Emma's father gave her "a ball shaped like a screaming baby face that actually cried when you threw it.
