The Angry Eyebrows are the titular major antagonist of the Larryboy: The Cartoon Adventures episode "Larryboy and the Angry Eyebrows".
The Angry Eyebrows are created by Awful Alvin to make people around Bumblyburg angry. The abilities of those monsters are sticking on people's forehead once that person is angry and he will stay angry. Larryboy was one of the victims, but he controlled his temper and the angry eyebrow went away. Larryboy made all of these monsters go in the hat machine and they all became one big hat.
The Angry Eyebrows are likely based on bats. They look like flying eyebrows with two small red eyes.
The Angry Eyebrows are mindless parasitic monsters and all they want is to find a host and stick on his forehead.
VeggieTales in the House