I won't mention any brand names as GNHQ might not approve but you should also be able to find vegan ice cream (vanilla or raspberry) , fruit yoghurts made from soya milk and vanilla, chocolate or caramel soya custard puddings. You can also get soya cream. Coconut milk and coconut cream are useful for sauces.
If you are going to make pancakes, of course without eggs, the easiest recipe is soya milk and self-raising flower, nothing else, just mixed to a runny cream and cooked with a little sunflower oil or vegan margerine. These can be filled with fruit or vegetables (I found mushrooms most popular), then if you like you can fold them over and pop in the oven to crisp up. (a bit like the crispy pancakes my children liked in the 1970s)
Young children often have very conservative tastes. They like what they know. Have you asked his Mum what his favorites are and what he really doesn't like?