Yes. Members of the Church of Jesus Christ of Latter-day Saints (the 'Mormon' church) believe that the deceased can interact with the living, especially if they are sent in errand by God. Mormons believe that this occurred throughout the Bible, because 'angels' are the spiritual embodiments of people who have or will live on earth.
So, Moroni (a Book of Mormon prophet) returned to teach Joseph Smith about the Book of Mormon.
John the Baptist returned to restore the Priesthood of Aaron to Joseph Smith.
Peter, James, and John returned to restore the Melchizedek Priesthood to Joseph Smith.
Moses, Elias, and Elijah returned to bestow various priesthood keys upon Joseph Smith.
Aaron WHO? Because this question is in the religious section, I am assuming that you mean Aaron the brother of Moses. Aaron had four sons, Nadab, Abinhu, Eleazar and Ithamar. Aaron and his sons were appointed to the lesser priesthood, which became know as the Aaronic Priesthood. This was because of the rebellion of the people while Moses was upon the mount receiving the Commandments.
God gave the Law to Israel via Moses, and as much of the Law directly concerns the priesthood headed by Aaron, this means the two key people in Leviticus are Moses and Aaron.
Aaron Joseph was born on 1989-07-04.
Moses wrote about the priesthood of Aaron primarily in the Book of Leviticus, which is traditionally attributed to him and is part of the Torah. Key sections detailing the priesthood and its duties can be found in Leviticus chapters 8 through 10, where the consecration of Aaron and his sons as priests is described. This is believed to have been written during the Israelites' wanderings in the wilderness, shortly after their exodus from Egypt.
Aaron Schwindt's birth name is Aaron Joseph Schwindt.
Aaron Meeks's birth name is Aaron Joseph Meeks.
Aaron Wiggins's birth name is Aaron Joseph Wiggins.
Aaron Jaeger's birth name is Aaron Joseph Jaeger.
Aaron Mathias's birth name is Aaron Joseph Mathias.
All male descendants of Aaron - Moses' brother are Cohanim; priests (Numbers ch.3).
There are actually only two priesthoods, the first is the Aaronic named after the brother of Moses, Aaron. Within that priesthood are three offices that of Deacon, Teacher and Priest. The other priesthood or higher priesthood is the Melchizadeck priesthood named after the righteous king of the same name. Within that higher priesthood one may hold the office of Elder or High Priest.
Noah, Abraham and Sarah, Isaac and Rebecca, Jacob and Leah, Joseph, Moses, Aaron, and Joshua.