What you're describing sounds normal to me.
As long as the snake is moving and exploring with slow, deliberate movements, with consistent, steady tongue flicks I would say it's just exploring. Perfectly normal.
If the snake is moving with jerky, erratic movements, fast tongue flicks and heaving lung compressions the snake is nervous.
It's ok to see the expanding and collapsing of the lungs, but it shouldn't be fast as glaringly obvious.
Slow, deliberate and relaxed = exploring
Jerky and erratic = stress
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