I've tried to sneak up on tongue. Sometimes I wait until it is busy drinking my bottle, or busy eating oatmeal, and when 'tongue' isn't looking I sneak my fingers into my mouth and grab. Unfortunately while 'tongue' does seem surprised by these sudden attacks, it also tends to be slipperier due to the milk, oatmeal, etc. (Of course slimy tongue is definitely my favorite version).
I have yet to be successful in my attempts to capture, remove, and examine 'tongue,' but fear not, I will not give up. Determined is my middle name.
err....wait, actually Parker is my middle name....you know what I mean.