People or things that squall, which means to cry loudly and harshly.
Squallers are usually not very pleasant because they make a lot of noise.
Examples:
The baby is one of the loudest squallers I've ever heard.
The squallers outside woke me up from my nap.
I don't like being around squallers when I'm trying to concentrate.
The squallers in the movie theater made it hard to hear the movie.
The squallers at the zoo were so loud, I could hear them from far away.
The squallers in the nursery made it hard for the parents to sleep.