Well, not really. A memoir is about the author's real life journey. Fictional stories would deviate from the essence of a memoir which is to share real, personal memories. However, some memoirs might use fictional - like techniques to make the real stories more engaging, but it's not a bunch of fictional stories.
No. A memoir is supposed to be based on real personal experiences. If it's a bunch of fictional stories, it would be more like a fictional novel rather than a memoir.
Typically not. A memoir is a non - fictional account of one's life. While there might be some elements of creative writing in how the stories are told, they must be rooted in truth. Fictional stories don't belong in a memoir as it would mislead the readers about the author's real life.