To answer your question about why Tramp calls Lady "Pideon", you have to remember that an alternative definition of that word is "one who is easily fooled or duped". When Tramp first sees Lady, Jock, and Trusty in Lady's yard, her hears them discussing how wonderful babies are for a family. Tramp laughs at the idea that a baby will not change anything when it arrives. He calls Lady "pigeon" because Tramp believes that the arrival of the baby will change EVERYTHING- for the bad. By calling her that, he is gently mocking Lady's naivete.
As you say, Tramp refers to Lady as "Pidge" throughout the film - but it becomes a term of endearment rather than ridicule.
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