Use "oca" in a sentence

1. entered Castile and were approaching the Montes de Oca -

2. ‘They had a hard time of it in the Montes de Oca,

3. almost wished they were back in the Montes de Oca

4. One called oca was like the usually yellowish ones in the north, although they were not limited to that color here, and another called chun~o that came in all sizes and shapes, but were generally white, gray, yellow, or bluish inside