I'm not sure bugs will become a popular snack anytime soon, but they're definitely food for fort.
2019年12月六级真题（第二套）听力 Section B
柯林斯高阶英汉双解学习词典释义
N-COUNT; N-IN-NAMES
堡垒;要塞;城堡
A fort is a strong building or a place with a wall or fence around it where soldiers can stay and be safe from the enemy.
PHRASE
替人照料;代为负责
If you hold the fort for someone, or, in American English, if you hold down the fort, you look after things for them while they are somewhere else or are busy doing something else.