Neonate and Small fry

Neonate noun - A recently born person.

Small fry and neonate are semantically related In some cases you can use "Small fry" instead a noun "Neonate".

Small fry noun - A young person of either sex.

Neonate and small fry are semantically related in child topic. Sometimes you can use "Neonate" instead a noun phrase "Small fry", if it concerns topics such as very young person.