A frog exists as a symbol of beauty in spite of the fact that it is so ugly. This is because of the story of the frog prince or the princess and the frog as it is sometimes referred to. This is where a gorgeous prince is turned into a frog by a witch and she tells him that the only way he can become a prince again is if he is given a kiss by a beautiful princess. It is hard for him to get the kiss of course because everyone thinks he is trying to trick them into kissing him since frogs are so ugly and attention starved but eventually the princess realizes his inner beauty, kisses him, and they live happily ever after. This is one tale which the dream meaning of a dead frog can be partially derived from.
If you have a dream about a dead frog it might mean that you feel like you have progressed from an earlier, uglier period in your life. You feel prettier now and you think that you have made it out from where you used to be as an ugly frog. Take advantage of this newfound confidence and go out there and just be you.
If you have a dream about a dead frog it means that you feel like your inner beauty has not been noticed. You may not find yourself attractive on the outside but you sure thought you had something to offer on the inside. But now all these things are coming up which are convincing you that you may not actually have all that inner beauty that you thought you did. You have to ignore these thoughts though because everyone is beautiful on the inside and everyone shares some beauty. Just because other people aren't noticing you now don't mean you won't be noticed one day. Have faith that you will one day be happier, and it will come true, believe it or not.