I don’t think it would be any funnier if he was. I don’t think there is actually any humour in the poem but in a kid finding something like that so funny that snot came out and getting in trouble.
When I was in first year juniors my teacher was called Miss Dawson. We all called her Miss Doorknob. One day I was in trouble and got sent to the headmaster where I accidentally referred to her as Miss Doorknob. He didn’t take it well.
[Side point - I can remember the names of all four of my primary school teachers. Does this make me odd?]