Untitled Poem

When I was young I learned the rhyme
    The little frog was colored pink;
    It was a poem that made me think.
And soon enough, in course of time,
I learned another bit of verse,
    I’ve never seen a purple cow.
    And also learned of Burgess how
    He two years latter added to it
    Threats lest anyone should quote it.
Although my rhymes are clearly worse,
These rhymes are two I keep in mind
When Friday morn I try to find
A bit of doggerel to flog
To all the readers of my blog.