"Toads" by Philip Larkin - Extended Metaphor

I see an extended metaphor in the poem "Toads." The poem is regarding the poor, unskilled laborers of society. He refers to them as toads - ugly, worthless creatures. He rejects their desire to have a better life. He says, "Ah, were I courageous enough to shout Stuff your pension!" Wow! He acts like no matter what they do, they will survive, so why try? He basically says that with,  "no one actually starves. He explains this by comparing them to toads - they seem to survive no matter what. But he does confess that he sometimes has the same desires as the "toads." This can be interpreted as every girl's desire (little or small) to be the toad/frog in the princess stories. Even though being the toad is so despicable, the result is amazing. I see that the author, even through his snubbing of the lower class, is expressing his occasional desire to be with them by using the toad metaphor. He wants to have something they have that he doesn't - community.