l recently bought bob skates for my 2 year old son - similar to these http://amazon.com/dp/B0000CE099?smid=AMU1FHQN44VUO&tag=msnshop-sports-20&linkCode=asn although my gut is to have them sharpened, l wonder if it is necessary or can even be done?

No. they are supportive and provide the stability he will need. They are usually made out of aluminum which cannot be sharpened.

Let Bob sharpen his own damn skates!!!!

These skates can not be sharpened. Most skates you will sharpen, but these ones you can not.

Double-bladed skates cannot be sharpened. Regular ''one bladed'' skate blades are wider than the blades on double-bladed ones. They have edges and a hollow in the middle, so that if you were to look down a blade, it would have a ''U'' shape to it, so if you look at your little guy is skates, you will see that they're pretty thin. :)