A.) Yes, it was Pietrangelo. As a member of the goalie community, Panger remembers Frank Pietrangelo, Penguins back-up goal-tender. Here is his
wikipedia page. His cousin had a son. That son is Alex. Here is a video of Frankie's most well-know NHL moment, "The Save":
B.) Oshie is being a little **** to Tarasenko by naming giving him the nickname of Frank. It seems highly likely that it is a reference to the movie "Old School," in which Will Ferrell's charater is named Frank Ricard. Better known as, "Frank the Tank."