leapfrog vs come along

leapfrog is a noun but come along is not a noun.

Word	Noun	Adjective	Verb	Adverb
leapfrog	Yes	No	Yes	No
come along	No	No	Yes	No

As verbs, come along is a hypernym of leapfrog; that is, come along is a word with a broader meaning than leapfrog:

Other hypernyms of leapfrog include advance, come on, get along, get on, progress, shape up.

leapfrog (noun)	come along (noun)
a game in which one child bends down and another leaps over
advancing as if in the child's game, by leaping over obstacles or competitors

leapfrog (verb)	come along (verb)
progress by large jumps instead of small increments	come into being or existence, or appear on the scene
to vault	develop in a positive way