Clark, 11, who leads the Children's Parliament, spoke out after an emotional meeting with Hollie Dance, the mother of tragic Archie Battersbee.
Archie died aged 12 in 2022 in an accident said to have resulted from a prank or experiment gone wrong.
Clark also spoke to Lisa Kenevan, who believes her 13-year-old son Isaac died taking part on an online "choking challenge".
The mums are campaigning for greater online safety for kids, warning more will die if dangerous stunts and challenges continue to spread unchecked on online platforms.
Clark wrote to TikTok: "Two people have sadly died attempting to undertake the challenges on these disgraceful videos which I have been informed involve holding your breath for extremely long lengths of time.
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