"skinny frame" is a correct and usable phrase in written English.
You can use it to describe someone's body type, for example: "She was a petite woman with a long neck and a skinny frame."
She loved showing her skinny frame.
Late Tuesday night, the burdens clung to Jennings's skinny frame like heavy linen.
His long nose, big ears and pale, skinny frame made him an improbable romantic hero.
8 Even some magazines hated her skinny frame, blaming her for spawning a generation of anorexics.
A skinny frame and wispy hair tell of her own limited supply of calories.
Romando wore a checkered short-sleeved shirt, which hung loosely from his skinny frame.
Both combine athletic, skinny frames with technical excellence.
Our skinny frames put together meaty baseball careers in the face of a game that emphasized power.
All were around the same age and several looked very similar: posters hanging all over the city show that they had long, straight dark hair and skinny frames.
Neanderthals had short, compact bodies to conserve heat and large nasal passages to warm frigid air, while our African forebears had long, skinny frames suited to hotter climes.
She packs a big, sultry voice into her small, skinny, girlish frame.
