The word cangalló is the preterite form of cangallar in the third person singular.
See the full cangallar conjugation

cangallar

El lunes 26 de agosto a las 10 de la mañana se dio inicio a la exhumación de fosas comunes en los parajes de Sancaypata y Ccarpacassa, ubicados en el distrito de Totos, provincia de Cangallo, departamento de Ayacucho.
On Monday August 26th at 10 a.m., the exhumation of common burials was started in Sancaypata and Ccarpacassa, located in the Totos district, province of Cangallo, department of Ayacucho.
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