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Some people pronounce their [ʃ] not in the 'classic' way but by curving the tongue and bringing it forward toward the upper set of teeth. Here's an audio example I've created.
My question: is there a known IPA symbol for this, and are there any languages that use this pronunciation?
EDIT: here's a video depicting the pronunciation.
Your sample is squarely in the range of IPA [ʃ], and not [ʂ], [ɕ] or [ç]. It sounds perfectly normal to me. This is the best place to get standard reference values for IPA letters. If you have samples that are distinct in some way, e.g. one speaker has pronunciation 1 and another has pronunciation 2, you can use IPA diacritics to "nudge" the phonetic values in some manner. For instance you could use the apical vs. laminal diacritics to distinguish two sub-types of [ʃ], if that is indeed what is going on. Bear in mind that people often "intuit" falsehoods about their articulation, so you ought to get objective evidence about articulatory state before making a claim about something that you can't actually inspect.
You're still producing the same sound, just with a different tongue placement. I hear the difference, I do, but it's still /ʃ/.
If this is for a writing project, something to do with your education (self-edification or formal), or something else you'll have to explain the distinctive tongue placement for the /ʃ/.
