You realize you destroyed your own argument right? Dwarves, halflings,duergar, and even possibly warfoged have tadpoles in game. The game also emphasises the tadpoles are different so the rules kind of fly out the window regarding ceremorphosis. Larian stated they had obtained a little room for creative freedom from Wizards of the Coast.
Not really, I pointed out an exception. In the game your halfling or dwarf can be given a tadpole, but under normal circumstances mind flayers don't take short folk for ceremorphosis, but exceptions can be made, it is possible to warp the process in order to produce a viable ceremorph from a halfling or dwarf, but the degree of success varies, though.
