There are two books which exist with that name. Both of which you can still purchase freely.
The Book of Thoth in Ancient Egyptian Legends by Margaret Murray
The Book of Thoth (Crowley) by Aleister Crowley
If on the other hand you mean the original "book" of Thoth, then no as this is not an actual book, but a mythical creation. Two of the most common tellings of the story are 1) the "book" is actually a series of ancient Egyptian hieroglyphs in a pyramid, said to have been placed there by Thoth himself
2) The book was real, and contained powerful spells and knowledge. Legend has it that it was buried with Prince Neferkaptah in the City of the Dead.
A book which you may find useful is "The Ancient Secret of The Flower of Life", by Drunvalo Melchizedek. It goes into more depth regarding the books of Thoth.
Thoth?
Each of the gods had their own unique Characteristics. One includes~ Thoth Thoth was the god of writing, wisdom, learning, and the moon. According to myth, Thoth invented writing, was the author of the Book of the Dead, and was the vizier and scribe of the afterlife.
Because of the privacy act, schools require proof of identity.
The Egyptian god Thoth did not die.
Thoth has many wives.
Thoth became associated with the Moon, due to the Ancient Egyptians observation that Baboons (sacred to Thoth) 'sang' to the moon at night. - crystallinks.com/thoth
They Each Had Their own Power. Example~ Thoth was the god of writing, wisdom, learning, and the moon. According to myth, Thoth invented writing, was the author of the Book of the Dead, and was the vizier and scribe of the afterlife.
Thoth - film - was created in 2001.
The head of Thoth is that of an Ibis.
The duration of Thoth - film - is 2400.0 seconds.
THOTH
Thoth is the Egyptian god of knowledge, secrets, writing, and scribes.