Jisho

I think you can use 短躯 for that.

短い means short in length. 低い means short in height.

If you want to say a person is short, you'd typically say [person]は背が低いです

背が高い and 背が低い are very common expressions for talking about the height of people.

@DoubleZeta this is technically an accurate word for a person who is short, I could only find 4 examples of its use in the balanced corpus of contemporary written Japanese. That's an indication that it's extremely rare.

@Leebo I went looking for it on the JP Wikipedia article for Pepin the Short (ピピン短躯王), since I figured it was most likely used for nicknames and titles rather than being a common adjective for describing people.

Expanding on what @Leebo said, "短い means short in length. 低い means short in height."

Examples for 短い include:

彼女の髪の毛は短いです。(Her hair is short)
and
短い期間 (a short period of time)