Though not as well documented as the Kinderhook Plate debacle, Joseph Smith once again reveals he is a charlatan with the Greek Psalter incident.

"He led the way to his house, accompanied by many elders, preachers, and other Mormon dignitaries. On entering the house, chairs were provided for the prophet and myself, while the curious and gaping spectators remained standing. I handed the book to the prophet, and begged him to explain its contents. He asked me if I had any idea of its meaning. I replied, that I believed it to be a Greek Psalter; but that I should like to hear his opinion. "No he said; "it ain't Greek at all, except, perhaps, a few words. What ain't Greek, is Egyptian; and what ain't Egyptian, is Greek. This book is very valuable. It is a dictionary of Egyptian Hieroglyphics." Pointing to the capital letters at the commencement of each verse, he said: Them figures is Egyptian hieroglyphics; and them which follows, is the interpretation of the hieroglyphics, written in the reformed Egyptian. Them characters is like the letters that was engraved on the golden plates." Upon this, the Mormons around began to congratulate me on the information I was receiving. "There," they said; "we told you so -- we told you that our prophet would give you satisfaction. None but our prophet can explain these mysteries." The prophet now turned to me, and said, "This book ain't of no use to you, you don't understand it." "Oh yes," I replied; "it is of some use; for if I were in want of money, I could sell it for something handsome."

...Having exhibited the book to the prophet, I requested him in return to show me his papyrus, and to give me his own explanation, which I had hitherto received only at second hand. He proceeded with me to his office, accompanied by the multitude. He produced the glass frames which I had seen on the previous day; but he did not appear very forward to explain the figures. I pointed to a particular hieroglyphic, and requested him to expound its meaning. No answer being returned, I looked up, and behold! the prophet had disappeared. The Mormons told me that he had just stepped out, and would probably soon return. I waited some time, but in vain..."

http://www.olivercowdery.com/smithhome/1840s/1842Cas1.htm

See also:

http://www.mormonthink.com/greekweb.htm

The May 15, 1843 issue of the official Mormon periodical Times and Seasons contains an article, purportedly written by Joseph Smith, Jr., deriving the etymology of the name "Mormon" from English "more" + Egyptian mon, "good", and extolling the meaning as follows:

It has been stated that this word [mormon] was derived from the Greek word mormo. This is not the case.

There was no Greek or Latin upon the plates from which I, through the grace of God, translated the Book of Mormon.

Let the language of that book speak for itself. On the 523d page, of the fourth edition, it reads: And now behold we have written this record according to our knowledge in the characters which are called among us the Reformed Egyptian ... none other people knoweth our language; therefore [God] hath prepared means for the interpretation thereof." ... [The] Bible in its widest sense, means good; for the Savior says according to the gospel of John, "I am the good shepherd;" and it will not be beyond the common use of terms, to say that good is among the most important in use, and though known by various names in different languages, still its meaning is the same, and is ever in opposition to bad. We say from the Saxon, good; the Dane, god; the Goth, goda; the German, gut; the Dutch, goed; the Latin, bonus; the Greek, kalos; the Hebrew, tob; and the Egyptian, mon. Hence, with the addition of more, or the contraction, mor, we have the word MOR-MON; which means, literally, more good.[13]