Lizard emoji is the picture of an adorable little crawler (it is an unspecified kind of a Lizard in all emoji providers’ versions except for Apple’s one where it is obviously a gecko). It may be used together with other crawlers like 🐍 Snake emoji to illustrate the variety of these animals. Also, it is used to denote lizards many people keep at home as pets. As for indirect meanings, this emoji has almost no specific ones.
Examples of using
“I caught a lizard today 🦎”
“Lizards can run surprisingly fast 🦎”