Yep. They usually do it to realign their jaws after eating. They will sometimes also yawn outside of feeding; their scent glands are located at the top of their mouths, which is where their tongues rub against after they've flicked it. I've noticed when I have mine out, she'll pause and yawn before she goes to explore something.
Excessive yawning, however, can be a sign of respiratory infection, and if coupled with other symptoms (popping noises, stargazing, open-mouth breathing, etc), that merits a vets visit.
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