The word amontoné is the preterite form of amontonar in the first person singular.
See the full amontonar conjugation

amontonar

Amontoné a los niños en el coche y partí.
I bunched the kids in the car and drove off.
Amontoné toda la ropa en la cama y empecé a planchar.
I piled all the clothes up on the bed and started ironing.
Cuando se almacenen o se muevan las pinturas, nunca las amontone horizontalmente.
When storing or moving paintings, never stack them horizontally.
No amontone el texto.
Don't crowd the text.
Dejo que se amontone.
I let it pile up.
No quiere que la gente se le amontone.
He doesn't want people crowding him.
Que la gente no se amontone.
Move some of these people.
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