Fruit-based snack bars are often thought of as a kid-friendly sweet, but this product contains dried fruit and a cocoa-style coating, so it is not equivalent to fresh fruit. For children, it should be treated as a sweet snack or dessert and offered as part of a balanced daily menu, not as a replacement for meals or whole fruit.
One practical check is the nutrition label: look at the sugar content and ingredient list to see how it fits with the rest of what your child eats that day. Also check for allergens, even though the product name suggests mango and chocolate, packaged foods often have other traces or ingredients. Young children should always be supervised while eating, and snacks should be appropriate for their chewing and swallowing skills.
If you have specific concerns about your child's diet, or if they are on a special eating plan, a pediatrician or registered dietitian can give more individual advice.