the.com/pup tent

means A small, simple tent — usually just two slanted flaps of canvas meeting at a ridge — big enough for one or two people to sleep in.

from The name comes from 19th-century American military slang: soldiers called these tiny two-man shelters 'dog tents' or 'pup tents' because sleeping in one, curled up with your knees to your chest, looked like a dog or puppy bedding down in a kennel. The term stuck through its use in army camps and later migrated into civilian camping vocabulary, where it still describes the same low, A-frame shelter.