Question

Why were monkey and crocodile friends

Answer 1

Because crocodile need monkey's heart he is interested in monkey's heart...
he is so greedy...

Answer 2

Since he had no friends, he wanted to make friends with him. Addressing the crocodile, Raktamukha said, “As you're taking rest under the tree, you're my guest and it's my duty to offer you food.” The monkey gave a lot of Jamuns to the crocodile to eat. The crocodile ate them to his fill.