Grindelwald and Tom Riddle

[drjuliehoward]

No: HPFGUIDX 87453

I still am intrigued by the mention on the date on the back of DD's 
chocolate frog that he defeated Grindelwald in 1945.  I know many 
have speculated that this either was Hitler or was connected to 
WWII, and I agree to the latter.  My question (and I have searched 
the archives briefly but not all 87000ish!) is there a connection 
between Grindelwald and Tom Riddle?  Riddle was at Hogwarts at the 
time, or immediately preceding.  Could this be the reason TR/LV is 
afraid only of DD?  I just have a hard time accepting the 
possibility that he simply was afraid of his Transfiguration 
Teacher.  

Julie