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This is Dr. David
psychologist have studied this age of development in children as they get older and start to toilet and potty train.
there can be many nerve endings in the anal area and that is why he could be liking to stick his fingers in his butt
he should be told that this is not acceptable behavior and should be disciplined in time out when he does this to re-enforce that this is not acceptable behavior when he does it himself or to other children.
he most likely will grow out of this phase as well
you should talk to his pediatrian about this.
how is he doing with potty training. he is not wearing a diaper anymore?
that is good he is doing fine with potty training
have you started time outs as a way of disciplining him when he does something wrong?