This is a stanza from Ruskin Bond's poem If Mice Could Roar:
If tortoise could run
And losses be won
And bullies be buttered on toast
I can't understand the phrase bullies be buttered on toast.
By the way, in another stanza of the same poem:
If pebbles could sing
And bells never ring
And teachers were lost in the post;
What is the meaning of post in this context?