This font is normally used for the Simpsons merchandising or pictures

Matt  Suggested by donshottype 

Custom Typeface called Matt
See: http://www.dafont.com/forum/read/66352/font
for a post by fonatica:
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Custom typeface.

According to The Simpsons Archive (http://www.simpsonsarchive.com/guides/lisa-2.html):

"The distinctive font used in the show's credits (and for just-about all show related merchandise) is called "Matt".
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