 They argued that Tol should be added to the Hokan stock, a large language stock, phylum or family, which was proposed by R. B. Dixon and Alfred D. Kroeber in 1913.In 1977, David Oltrogge proposed to link Tol to the extinct Subtiaba language of Nicaragua, and also to Chontal of Oaxaca, also known as Tequistlateco.This indirectly amounted to a mere sub-classification, since all of the three languages in question were part of the proposed Hokan stock.