Nope, don't know what they mean yet. So very Lostish.
Anyway, I was curious about which letter of the greek alphabet that was on the frog's back. I went to Wikipedia and there I made a delightful discovery. That symbol is the letter Phi and it is a representation of a "voiceless labiodental fricative". I love that! Say it! A voiceless labiodental fricative. That's awesome. What is this voiceless laboidental fricative you ask? It is the eff sound.
A voiceless labiodental fricative = ffffffffff.
To learn more labiodental consonants, you can go here...
And they said television isn't educational.