YouTube has put warnings on 'Momo' videos amid widespread concern among parents about the impact on children.
Parents have reported youngsters as being distressed after coming across pictures of the doll - originally a Japanese artwork - popping up in online videos.
'Momo challenge' messages that uses the doll imagery have been linked by authorities in other countries with self-harm and even suicide, although charities in the UK said there is no evidence of a link between Momo and British children being harmed.
Despite this, videos featuring images of the doll are still appearing on YouTube, with parents reporting the gaunt face appearing during Peppa Pig clips.
YouTube has now responded by putting warnings on those videos it has been alerted to, but is not removing them.
A 'Momo' video that has been viewed 150,000 since it was uploaded to YouTube last August tells the viewer: 'You are going to die' remains on the website more than six months on
After YouTube was alerted to the video by MailOnline, they put this warning ahead of the footage. The website is also banning so-called 'momo' images from its Kids app
MailOnline found one sinister video which features the voice of a little girl singing 'momo's going to kill you' and 'at night she'll come when you're in bed'.
The video has been on the site since August last year and has been viewed nearly 150,000 times.
After being alerted to the website, YouTube inserted a warning in front of the video, stating that the footage had been identified as 'inappropriate or offensive to some audiences'.
YouTube's policy is only to remove videos which 'promote, glorify or provide instructions' of the challenge said to be behind reports of deaths in other countries.
But the website is attempting to ban the image of the doll from its Kids app, which is designed to include only child-friendly content.
At the time of writing, around 80 videos showing or discussing the 'momo' phenomenon had been uploaded to the site in the past 12 hours, showing the amount of content YouTube is attempting to monitor.
Videos featuring 'momo' are still appearing on YouTube. The website will only remove those which 'glorify' the associated 'challenge'
The National Online Safety Group have release information for parents on Momo, but charities say authorities should not overreact
Those videos recently uploaded include the footage of Momo spliced into a Peppa Pig cartoon, about which parents complained earlier this week.