One of the most popular Hindi poems for children about peacocks is titled "Mor." It can be found on several sites, including Indif.com and Hindi Poems.
The e-book,"Peacock Poems for Kids: Four Poems About Peacocks for Children" is available from both Amazon.com and Barnes and Noble. It includes "The Peacock At Home," "The Butterfly's Ball," "The Fancy Fair" and "The Peacock and Parrot." GooglePlay has a free app called "Hindi Kids Nursery Rhymes, Vol. 2" that includes audio and text versions of several popular Hindi poems and rhymes, one specifically about peacocks. Finally, YouTube has several Hindi poems about peacocks such as "Peacock Dance" and "Peacock Bird."