You can find Snuggly the Crow on the roof of Firelink Shrine, after you have obtained the Tower Key from the Shrine Handmaid.
The crow, who will not appear to you, will trade items for those you drop in its nest.
"Pickle-pee" and "Pump-a-rum" come from an old children's poem called "The Ceremonial Band" by James Reeves. In the poem, "pickle-pee" is the sound of a fife and "pump-a-rum" is the sound of a drum.
When first met
Me, me, pickle-pee
Me, me, pump-a-rum.
When you offer a trade that is rejected
That no pickle pee.
That no pump-a-rum.
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