Here the typesetter for the 1906 LDS edition accidentally misread men as them. He may have been influenced by the usage in the previous verse, where men is used first and is then followed by the pronominal them in reference to “the children of men” (here I cite the 1906 text, which follows the 1837 editing):
The 1906 typo in verse 37 was not, however, transmitted to any subsequent LDS edition since that edition never served as a copytext. The critical text will maintain the original reading with men in Moroni 7:37.
Summary: Maintain men in Moroni 7:37, in accord with the reading of the earliest text.