small fry vs tyke

small fry and tyke both are nouns.

Word	Noun	Adjective	Verb	Adverb
small fry	Yes	No	No	No
tyke	Yes	No	No	No

As nouns, small fry and tyke are synonyms defined as:

Other synonyms of small fry include child, fry, kid, minor, nestling, nipper, shaver, tiddler, tike, youngster.

small fry (noun)	tyke (noun)
someone who is small and insignificant	a young person of either sex
a young person of either sex	a crude uncouth ill-bred person lacking culture or refinement