OK, so you can chemically synthesise fruit flavours for things like boiled sweets and those fake blueberries you can get in little cakes.
Does this mean that it would be possible to synthesise flavours of fruits that don’t exist (yet)? If not, why not?
Yes. They already do. Ever had a cherry that tasted like “cherry” flavour?
Fruit flavours are mostly a class of compounds called esters. Different esters give different fruit flavours. You can blend them to create all kinds of different flavours.
What fruit is Juicy Fruit?
Fruits that dont exist? No way!
OK,I know what you mean,You could start mixing flavors at home,see what you come up with,but non fruit flavors,the possibilities are endless! 
Hmm I just remembered about those Harry Potter beans with odd flavours in you can get in the US (I’ve never seen any for sale here in Blighty). Presumably they’re not really made out of ‘essence of earwax’ and such-like, so those must be artificially concocted.
OK, I tell you what’d be really cool (then again. I’d probably be the only person who would buy these):
10 boiled sweets in a packet, all different random flavours that don’t occur in nature made as Colophon suggested, and then given unusual colours too, like turquoise, puce, jade green and burnt sienna. These’d be in packets a bit like Jolly Ranchers could be. Then you could:
> See which ones turn out to be peoples’ favourites and least favourites.
> See what people think the flavours are supposed to be.
> Mix the colours up and repeat.
Per Yabob
from http://boards.straightdope.com/sdmb/showthread.php?t=256933
Of course you can. What I want to know is what sound do these non-existent fruit make when you eat them
It would be possible to blend fruity flavours that do not correspond exactly to the flavour of anything natural, but as Colophon said, they already do; very often, artificial flavours are sort of (attempts at)idealised versions of the natural ones.
Even if it were possible to blend entirely novel, different ones, it probably wouldn’t be all that impressive; the pallette of flavours from which to choose is necessarily limited to those we already consider fruity (otherwise your new fruit might just taste like bacon or onions) - this being the case, coupled with the enormous diversity of natural, edible fruits available to man, I doubt it would be possible to come up with anything remarkable in its novelty; it’s alweays going to be ‘sort of like strawberries’, or ‘like a blend of melon and peach’.
In fact real fruits are often described this way when they are first introduced to a new market - I remember Kiwi Fruit being described as ‘tasting sort of like grapes’, when they first hit the UK, and custard apples were described to me as being a blend of melon, banana and pear flavours.
Also, if you mix too many different flavours, you get pretty much the same result every time, regardless of the actual constituents of the blend (like when you mix too many different pigments, no matter what they are, you get brown).
I thought this was going to be about artificial flavors that aren’t fruit. Oh well.
They do it all the time. I’ve never heard of “Wildberries” actually growing in the wild, and whatever the hell a “razzberry” is, it bears little or no flavor resemblance to any raspberry I’ve eaten.
Food manufacturers can make anything taste like anything. See also: Fast Food Nation.