Eto o scored with an accurate free-kick in the eighth minute before he converted a penalty just before the half-time break to hand his side a 2-0 lead at the interval.
It was Eto o s time to turn a provider when he squared the ball for Kevin-Prince Mila who scored the third for the Young Lions shortly after the break.
Mozambique’s Gianluca Lorenzoni struck with five minutes left with a free-kick to deny Cameroon a clean sheet.
After conceding, they re-organised quickly and scored the fourth through Abdoulaye Yahya to end the group games with a huge win.
Meanwhile, Uganda qualified for the knockout stage after a hard-fought 2-1 win over Mauritania in Nouakchott.
Pozor, nase opozarja nov sin nogometne legende: Etienne Eto o je debitiral z dvema goloma - Novica
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APS - A la CAN U20, des fils d anciennes stars portent le Cameroun
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Cameroun : Etienne Eto o explique son émotion
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Afcon U20: Eto o condemns winless Mozambique, Kakooza powers Uganda into quarter-finals
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