Western Huasteca Nauatl is a native American language spoken in central northern México, also known as Western Huasteca Aztec, Náhuatl de Tamazunchale, and Náhuatl de la Huasteca Occidental. According to SIL

SIL International

SIL International is a U.S.-based, worldwide, Christian non-profit organization, whose main purpose is to study, develop and document languages, especially those that are lesser-known, in order to expand linguistic knowledge, promote literacy, translate the Christian Bible into local languages,...

's Ethnologue

Ethnologue

Ethnologue: Languages of the World is a web and print publication of SIL International , a Christian linguistic service organization, which studies lesser-known languages, to provide the speakers with Bibles in their native language and support their efforts in language development.The Ethnologue...

, there is 85% mutual intelligibility

Mutual intelligibility

In linguistics, mutual intelligibility is recognized as a relationship between languages or dialects in which speakers of different but related languages can readily understand each other without intentional study or extraordinary effort...

 between Western and Eastern Huasteca Nahuatl

Eastern Huasteca Nahuatl

Eastern Huasteca Nahuatl is a Nahuatl variety spoken by about 410,000 people in the eastern part of the region of La Huasteca in Mexico, spread over 1,500 villages in the state of Hidalgo, the northern part of Veracruz and the extreme north of Puebla....

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The Bible has been translated into it and there are also radio programs in this tongue.