The type of effortful retrieval associated with a person's feeling that he or she knows something (say, a word or a name) but cannot quite pull it out of memory is known as tip-of-the-tongue phenomenon.
For example, if a child or an adult has a good knowledge and understanding about a subject or topic but finds it difficult to tag or provide a name to it, it is known as tip-of-the-tongue phenomenon. Thus, finding it difficult to remember the name of a word.
