small man; short man
Refers to a man of small stature. Can be neutral or slightly informal; not inherently derogatory but context-dependent.
That small man is very kind.
小男が大きな荷物を運んでいた。
A small man was carrying a large package.
大男 describes an unusually tall or large man, while 小男 describes an unusually short or small man.
小男 describes a man of small stature, the direct opposite of 巨漢, a man of huge build.
Compound of 小 (small) and 男 (man). The reading こおとこ is a straightforward combination of the kun'yomi readings of the two kanji.