I come across line "And all I wanna do is to feed her lots of treats" In the song "I Love My Kitty Cat". Can verb " Feed" Have indirect object? Is direct object in this line "her" And indirect "lots of treats". If not then what part of speech is " Lots of treats "? Objective compliment?
Yes, the verb can have a direct and indirect object.
In "I feed my cat treats", the indirect object is the cat. The treats are the direct object and the cat is the one who eats them.
The 'treats' could not be an object compliment as you also asked because they aren't adding any detail to an object. An example of an object compliment would be "treats make my cat happy", because the cat has become happy.