The word amontonamos is the present form of amontonar in the first person plural. There are other translations for this conjugation.
See the full amontonar conjugation

amontonar

Todo el mundo, cámaras, todos nos amontonamos en la puerta.
Everybody, the cameras, everything, we piled out the door.
Una dificultad que experimentamos con frecuencia durante la oración es que nos amontonamos con distracciones.
Putting up with distractions during prayer is a difficulty that is often experienced.
No, pero las amontonamos aquí.
No, we just make sure there's plenty stacked.
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