In figuratively|lang=en terms the difference between froth and spark
is that
froth is (figuratively) unimportant events or actions; drivel while
spark is (figuratively) a small amount of something, such as an idea, that has the potential to become something greater, just as a spark can start a fire.
In lang=en terms the difference between froth and spark
is that
froth is to bubble while
spark is to give off a spark or sparks.
As nouns the difference between froth and spark
is that
froth is foam while
spark is a small particle of glowing matter, either molten or on fire or
spark can be a gallant, a foppish young man.
As verbs the difference between froth and spark
is that
froth is to create froth in while
spark is to trigger, kindle into activity (an argument, etc) or
spark can be to woo, court.