“Lounge” is about as relaxed as collective nouns get, and it’s an accurate read on how most lizards spend a good chunk of their day: sprawled on a warm rock, a sunlit wall, or a stretch of open pavement, doing very little on purpose.
That stillness is functional. Lizards are ectotherms, meaning their body temperature, and therefore their energy, digestion, and reaction speed, depends on absorbing heat from their surroundings rather than generating it internally. A lizard “lounging” in the sun isn’t being lazy; it’s actively regulating its metabolism. Good basking spots that offer heat, safety, and a quick escape route tend to attract multiple lizards at once, which is how a solitary-by-nature animal ends up forming something that looks, for a little while, like a group hangout.
“Lizards” covers a huge range of species, from tiny geckos to large monitors, so a lounge can look very different depending on who’s doing the lounging.
Example: “A lounge of lizards had claimed every warm stone along the garden path.”
Related: Collective Nouns for Reptiles · What Is a Group of Lizards Called?