This is the 16536th most frequent Russian word.
свежей
"Свежей" means "fresher" in English.
Here 'свежей' is used in instrumental case singular, describing the rolls eaten.
На завтрак я съел свежей булочки.
For breakfast, I ate fresh rolls.
The word 'свежей' is in instrumental case, associating the freshness attribute to spring metaphorically.
Свежей весной пахнет воздух.
The air smells of fresh spring.
'Свежей' here is used in genitive case to describe the modernity or current trend related to fashion.