I don't really remember, but this was a creepy cartoon series, similar to Scooby Doo.
Some kids were facing some monsters in their life, but unlike in Scooby Doo, the monsters were real, and I remember that some of those monsters were real people.
I think the art style was clay motion, and I remember that in one episode, a ghost was trapped in a school restroom. In another episode, two ghosts got bullied and trapped, and turned into a giant melted cheese.
It's not Scream Street. It has a similar art style, but some monsters are real people with costumes or old Photoshop.
I watched this, I think, in 2007/2008. It has the '80s/'90s stop motion style. I watched it in English, I think on Nickelodeon. I don't really remember