Final answer:
The word that means laughing in a childlike manner is 'giggle.' It is a light and playful laugh typically associated with children.
Step-by-step explanation:
The word that means laughing in a childlike manner is giggle. It is a light and playful laugh typically associated with children. For example, in the sentence 'The little girl couldn't help but giggle at the silly joke,' the word 'giggle' conveys the sound and joy of a child's laughter.