Answer:
jumping juvenile policy
Explanation:
Based on the information provided within the question it can be said that the type of policy that is being mentioned is known as a jumping juvenile policy. Like mentioned in the question this is a life insurance policy that is bough by a parent but is meant for a child, and the main difference in this policy is that it's value increases by 5 times its original value when the child reaches 21 years of age, even though the premium stays the same.