small fry vs pip-squeak

small fry and pip-squeak both are nouns.

Word	Noun	Adjective	Verb	Adverb
small fry	Yes	No	No	No
pip-squeak	Yes	No	No	No

As nouns, small fry and pip-squeak are synonyms defined as:

Other synonyms of small fry include squirt.

small fry (noun)	pip-squeak (noun)
someone who is small and insignificant	someone who is small and insignificant
a young person of either sex