In Spanish, the plural form is tamales, and the singular is tamal, or sometimes written as tomale. However, there is an ongoing debate on the “correct” use of tamal vs. tamale.  This debate references that in Nahuatl, both the singular and the plural form of tamal is tamalli, so using the word tamale honors the origin of the word.  So, many agree there is no “right” or “wrong” usage.