Well, the thread would be funny if I wasn't completely creeped out by the question & I hope it's fake. I thought kids knowing the correct anatomical terms was important for safeguarding? But of course the best interests of the child clearly aren't of interest to the adults here.
Also, apparently the penis-haver is sufficiently dysphoric that using the correct word 'penis' is upsetting but wandering around stark bollock naked in front of their 2 year old (presumably fairly often if the 2 year old is asking such questions) with their penis flapping around DOESN'T cause dysphoria. Yeah. Bollocks.