Maybe you watched a different cartoon, were not in that age group - or forgot?

There are many more accounts of that:

> The Groke has been widely considered one of the creepiest characters in fiction by many people and even by a study. In late 90's and early 2000's, when the 90's anime series - which is considered by many to have the scariest portrayal of the Groke in it - premiered in Poland, the Groke - known in Poland as Buka - caused a panic amongst Polish children. The Groke had different sounds - deep, eerie cold howls and moans preformed by voice actor Andrzej Bogusz. This, mixed with the darker colouring of the episodes (a trait shared with Finnish episodes and some other airings) and the fact that the Moomins were mostly played at night, in the Wieczorynka programming block caused the Groke to be widely considered one of the scariest childhood characters in Poland, both by 90's and early 2000's kids.

> Many children were horrified by her, were scared to go to sleep because of her, having dreams of her chasing them or turning into the Groke (some examples of such dreams could be found on the myslalemże.pl portal before it got shut down around early 2010's). The defunct portal Grono.net even had an Anti-Groke forum called ANTY-BUKA, where people would share their childhood stories about the Groke.

https://villains.fandom.com/wiki/The_Groke

And even first person:

> [google translate] How is it possible that a dark, buzzing figure can scare small children? Hey, I can't. As a child I was very afraid of it. Now I don't know why. When I talk to my peers (15 years old) they say they were afraid too. Why?

https://www.filmweb.pl/serial/Muminki-1990-119826/discussion...