The length of fame they both have depends on the duration they've been around. Shrek has been around since the early 2000s until 2013, so it lasted 13 years, whereas Pingu lasted more than this, the short answer to this question is that Pingu is more famous than Shrek.
goku
No they aren't, mostly Knuckles and Rouge are seen as enemies. Rouge does in fact have a crush on Knuckles but Knuckles has doesn't have the same feelings for Rouge, Rouge says that he's cute when he's angry but Knuckles feels disgusted over that.
Adele is more famous
When Rouge is around Knuckles,Knuckles gets annoyed.But when Rouge is around SHADOW,He doesn't mind.But sometimes,Shadow gets a little annoyed. One of the main reasons could be that in the videogames the relationship between Knuckles and Rouge hardly consists on love interest, it mainly consists in rivalry. On the other hand, the relationship between Shadow and Rouge consists in something more than just friendship or partnership. Also, there is a lot of sexual tension between Shadow and Rouge (ex. Sonic Battle and Sonic Rivals) while Knuckles and Rouge don't even have that much interaction and they don't seem to be so interested in each other.
Eminem is way more famous
goku
pingu
pingu
pingu
pingu.
Peter Griffin is more famous than Pingu
Pingu is more famous than Justain Bieber
Mario is definitely far more famous than Pingu.
rihanna
goku
Garfield
batman