Frankfort has a very sizeable Hispanic population living within the city limits. Many of those families have been here for decades, some say their previous generations came to the area from Mexico for seasonal agricultural work and just decided to stay. Then around 2000 a lot them had relatives in Mexico migrate (legally or illegally) to Frankfort in order to find work. It was an open secret than many of the small factories and warehouses in Frankfort and surrounding communities (Lafayette, Delphi, Lebanon, Kokomo, Logansport) would hire these workers with little or no documentation and/or fake/copied SS numbers. That seems to have died down over the last 10-15 years, but I'm sure it still goes on. That is why if you look at the latest IDOE data for FHS it shows the student population being 55% Hispanic. The school corporation as a whole stands at 52.2% student being Hispanic.
In contrast all the other government schools in Clinton County (Clinton Central, Clinton Prairie, and Rossville) have White student populations over 90%.