The solution to "Frogs to Princes" is as follows:
 
Frog 1 - E1 F1 G1 H1 I1 J1 K1 L1 M1 N1 A2 A3 A4
Frog 2 - L1 M1 J2 I2 H2 G2 F2 E2 D2 C2 B2 B3 B4
Frog 3 - A1 B1 C1 D1 C2 D2 E2 F2 G2 H2 I2 F3 D4
Frog 4 - H1 I1 J1 K1 H2 G2 F2 E2 D2 C3 D3 E3 C4
 
I worked on it for about five hours with dry erase markers, the board drawn on paper, and a plastic sleeve.
 
BTW - your site's great!  Only found it last week, but I intend to be here a lot more!  ::)
 
- Matt Elder - "HappyMutant"