You mean Swedish Krona (which is the currency in Sweden) or dollar bills that you got in Sweden?
If you are talking about bills in Swedish currency you can exchange those at
1) City Hall in Disneyland® Park,
2) the Guest Relations Lobby just inside the Disney's California Adventure® Park Main Entrance,
3) the Guest Relations Window located to the left of the Disney's California Adventure® Park Main Entrance, or
4) The front desks at the Hotels of the Disneyland® Resort
according to the Disneyland section of the official Disney website.
They are working with a service named Travelex. If I recall correctly they are charging rather high fees. Try your local bank, I'm pretty sure they are charging less.
The Bank on Main Street *should* be able to convert for you, but why waste valuable time at DLR standing in line to convert money? I'd get it taken care of at your local bank before your trip.
I too, believe that it would be best to convert your money at home. That way, not only will it already be taken care of (Foreign money exchange) but you will also be able to avoid what sounds to be high exchange fees at Disneyland.
When my father was to visit Europe (His homeland is/was Austria) he would exchange his American currency here (In U.S.) the way I remember it, before leaving for his trip.