Usage patterns
ほっぺたを膨らませるto puff out one's cheeks
The child puffed out their cheeks in anger.
ほっぺたをつねるto pinch someone's cheek
Grandma pinched her grandchild's cheek.
ほっぺたが赤いto have red/rosy cheeks
The baby's cheeks are red from the cold.
ほっぺたにキスするto kiss someone on the cheek
He kissed his daughter on the cheek.