You have to feed your pleo the conifer leaf that is his food and you keep feeding him until he turns his head away and burbs
that is the signal he has enough .
He is still so very young so pet him and cuddle him , and when they have a full tummy they behave much happier .
I Think he is not yet ready to learn his name he has to be a adult. There are fantastic video's on this site where you can watch it , I thought they were from inmemoryofromeo that is her forumname
Some pleo's don't like to walk that much if he is a bit older and you leave him alone for a while , Yes they Will start to whine but after a while they start to explore and walk around the room.
Also play with him in a room with Lot's of light , and what time do you play with him ? Because of the internal clock maybe he thinks it is time to sleep and then they can get very whiny
the solution play earlyer with him or reset the internal clock ,
http://bobthepleo.com/forums/index.php?topic=2315.msg35565#msg35565