While playing "Frogger: Helmet Chaos" with one of the following GBA games in the second cartrige slot you will unlock hidden costumes in the "Costumes" menu.
With "Frogger's Journey: The Forgotten Relic" you get the "Punk Costume"
With "Frogger's Adventures 2: The Lost Wand" you get the "Pirate Costume"
Insert Frogger's Adventures - Temple of the Frog into the GBA slot in your DS to unlock the Santa costume in Helmet Chaos.
|Afro Wig||Finnius, Frogger, Frogger, Wani|
|Mohawk Wig||Berry, Lily, Lumpy, Lily|
|Pirate Hat||Frogger, Berry, Finnius, Frogger|
|Santa Hat||Lily, Lily, Wani, Wani|