You are attacking a straw man. That is, no knowledgeable LDS scholar would claim that all or even most Native American languages are derived from Hebrew.
Moreover, most scholars believe that the Book of Mormon lands were in Central America. So if you are looking for evidences of Hebrew in Iroquoian and Algonquian, you are likely looking in the wrong place.
My apologies; I stand corrected. I'm not very familiar with LDS scholarship, so would colorcountry be right in saying that most LDS scholars today maintain that the Hebrew-derived groups were a smaller subset of an already-established larger population of indigenous Americans?
The Linguists have found no evidence of Hebrew in the Central or South American lands either.
From the BOM Text:
Mormon 9:32-34
32 And now, behold, we have written this record according to our knowledge, in the characters which are called among us the reformed Egyptian, being handed down and altered by us, according to our manner of speech.
33 And if our plates had been sufficiently large we should have written in Hebrew; but the Hebrew hath been altered by us also; and if we could have written in Hebrew, behold, ye would have had no imperfection in our record.
34 But the Lord knoweth the things which we have written, and also that none other people knoweth our language...