Oh, right. Fronks appear infrequently or rarely throughout every level in the game as harmless "bonus enemies". If you're lucky enough to catch and defeat one before it gets away, you can get a swell amount of gold from them.
That, and appearing at other intervals throughout the game as usual.
On another note, is it weird that I can already see a development story for this game happening?
Goro Abe: "I've always wanted to do more with the characters in the WarioWare series, but never got the chance to do so. Until now...
...We got a start with it in Game & Wario, but we've decided we should expand upon that even more! ...
...We then thought, what if we could make a platformer type of game where you play as all of them? ...
...But, they're all completely different from each other, and all have different goals! How is it possible to get them all together in an adventure? But then I realized, a lot of us here in this team love playing Kirby Super Star, and decided we could easily take inspiration from that...
...We even went and presented the idea to HAL, and they loved it!"
Some dude from HAL: "Yes, that's right! Not only that, but we even co-developed this game!
...We also let them use a few Kirby characters in 9-Volt's level. We also find the WarioWare characters to be an intriguing, quirky bunch, so you can tell that our relatoinship when working on this game grew well!"