The girls were charged with "insulting the head of state" last Monday and could face up to five years in prison.
Addressing the allegations against them, Mr Prosper said there is "not any evidence of guilt" apart from the books being under their names.
"Authorities should focus on holding perpetrators of serious rights violations to account instead of jailing schoolchildren for doodles," the group's Central Africa director, Lewis Mudge, said.
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