They are mischievous , frequently playfighting and causing a mess .
In the CITV children 's show The Treacle People , boggarts are furry , gremlin - like creatures that originate from the Treacle Mines .
children are mischievous , frequently playfighting and causing a mess .
In the CITV children 's show The Treacle People , boggarts are furry , gremlin - like creatures that originate from the Treacle Mines .