Direct question: among others, has anybody ever 'disproved' the intact tongue of St. Anthony back in Italy? Has any atheist/skeptic ever tried to?
That is not how this logic, evidence, and rationality thing works.
It is not up to skeptics to 'disprove' any such claim, it is up to those making the claim to provide their case (demonstrable and falsifiable evidence, and reasoned argument) for their claim.
Until those making the claim that this 'relic' is indeed: tongue tissue, ancient, was dug up after a body decomposed, belonged to 'St Anthony', and, the only way it could have survived intact for so long is a 'miracle', I have no justification to accept the claim.
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