The children say they were kidnapped late on Sunday, and they do not know where they are being held.
The London-based human rights advocacy organisation has expressed solidarity with the families of the children and called on Cameroonian authorities to "do everything in their power" to ensure all those abducted are freed unharmed.
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Cameroon's North-West and South-West regions have been hit by a secessionist rebellion in recent years.
"I was taken from school last night by the Amba boys", one said, while a heavily accented man shouted at him to "talk louder". Between February 2017 and May 2018, for example, at least 42 schools in the regions were attacked, including 36 that were damaged by arson attacks, 11 damaged by other types of attacks, as well as two school buses burnt down and various harassments and attacks on students and teachers.
At least 81 people, mostly children, were kidnapped from a school in Cameroon's Bamenda on Monday, Reuters reported quoting government and military officials.
Violent separatists took up arms to destabilise the Anglophone regions to win independence for the areas they want to declare a separate state, which they call Ambazonia.
Local governor Adolphe Lele L'Afrique Tchoffo Deben placed the blame on local English separatist militias, though no one group has claimed responsibility at this point. More than half of those abducted were children.
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Rebels have gunned down Cameroon troops, pictured, and police.
About 20 percent of Cameroon's 22 million people are English speaking.
In 2016, demands for greater autonomy grew but met with a rebuff by Mr Biya.
No country has recognised the self-declared state.
Anglophone secessionists have imposed curfews and closed schools as part of their protest against Biya's French-speaking government and its perceived marginalisation of the English-speaking minority, although they had never kidnapped children before.
At least 400 "ordinary people" and more than 175 members of the security forces have been killed according to statistics by local and worldwide groups that have been documenting abuses in the escalating violence, including AI.
The CDC runs banana, palm oil, and rubber plantations in Cameroon's troubled southwest and northwest regions.
More than 300,000 other have fled the violence, some crossing into neighbouring Nigeria.