Never heard of it, and i guess i'm blind because i only see the third picture showing a blurry curl of something lol
Just looks like a snake flicking its tongue out, in the second one.

It'd be interesting to keep an eye out for. Some other weird shed i've noticed before was a shed of the actual anus from my sand boa. She shed this complete shed, with the vent scale showing, and a folded in part where it *was* her opening and the whole outter layer of her cloaca. Only snake shed i've seen like that. All the others seem to tear off at that part, and leave a "vent hole" in the shed.

I suppose it makes sense that the tongue would shed...sure weird though!

Here's what i could find:
http://theexoticvet.com/wp-content/uploads/Shedding.pdf