Frogger: Helmet Chaos
Pirate costume
Have the Game Boy Advance game Frogger’s Adventures 2: The Lost Wand in the cartridge slot to unlock the Pirate costume.
Punk costume
Have the Game Boy Advance game Frogger’s Journey: The Forgotten Relic in the cartridge slot to unlock the Punk costume.
Santa costume
Have the Game Boy Advance game Frogger’s Adventures: Temple Of The Frog in the cartridge slot to unlock the Santa costume.
The image featured at the top of this post is ©The Legend of Heroes: Trails of Cold Steel III key art / Original