1 something that is not serious and has no real value, but is entertaining or attractive -- frivolidades
2 to (cause a liquid to) have or produce a lot of small bubbles that often rise to the surface -- hacer espuma (en)
3 a mass of small bubbles on the top of a liquid etc -- espuma
Some types of beer have more froth than others.
4 to have or produce froth -- espumajear, hacer espuma
Mad dogs froth at the mouth.