Lol side note the episode of Goosebumps 'The Haunted Mask' and 'Night of the Living Dummy' personally left me terrified when I was younger as did the books
As a kid, I could watch Alien, Leprechaun, Hellraiser, and be completely fine.
But I had non-stop nightmares of Stay Puft and the Terror Dogs from Ghostbusters
The Haunted Mask episode was pretty dang good horror for kids. I know many friends who were terrified of Are You Afraid of the Dark's "The Tale of the Dead Man's Float". I somehow missed that episode growing up, but I have no doubt that one would've wrecked me as a kid.
...meanwhile the thing that *did* terrify me as a kid? The trailer for Home Alone 2...specifically the start of it which had the camera circle a CGI Statue of Liberty who proceed to scream like Kevin the moment the camera zoomed in on it. Screaming Lady Liberty scared the HELL out of me, I would not watch anything which had that trailer in front of it. Which made things difficult for watching FernGully since I loved FernGully, but I knew the trailer for HA2 was in the VHS, and I wouldn't listen to my Mom's insistence that she could fast-forward through the trailer. (She got real good at knowing when it was past the trailer.)