noun
cheek pouch
Refers to the expandable cheek pouches of animals such as hamsters, squirrels, and some monkeys, used for temporarily storing food.
ハムスターは頬袋にたくさんの餌を詰め込む。
Hamsters stuff a lot of food into their cheek pouches.
Compound of 頬 (hō, 'cheek') and 袋 (fukuro, 'bag'). The reading ほおぶくろ is a straightforward combination.