Robert

Sure, you can make bonsai with fruit trees. There are lots of bonsai plums, cherries, etc. Many of these are just flowering, and don't necessarily produce fruit. I think you might be thinking of those which do produce fruit. Apples are quite popular....The fastest way to get a fruiting apple is to air layer it fro,m a mature tree. Otherwise, you might have to wait some years for the fruit to come. With an air-layer, it's as old as the parent tree, and probably produce fruit the next year. Be aware, however, that apples, and other fruiting trees, produce fruit at the normal size....not dwarfed fruit. For instance, an apple tree 18 inches tall might produce a regular sized apple...perhaps 3 inches in diameter...it gets heavy, and does look VERY out of proportion.
I have some catoneasters which produce berries, and they look like small apple trees with fruit IN proportion.....but, of course, they're NOT apples.
Incidentally, this is the first time I'm replying to an inquiry on bonsaitalk....it's a new experience for me.

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Robert.........in Sta.Cruz