will a bass hit a swimbait in a trout pattern if trout are not even a native fish or stocked in that lake?

Yes. If it swims, a bass will eat it.

Yes, let me put it to you this way. If you release a non native fish into a lake, i.e. Fish Tank stocking, just because that Fish is not what they are used to seeing, does not mean it will not be eaten. Another example are the bait stores around me. The stores don't sell native fish to use as bait, but the bucket brigade still catches fish on them.

I actually caught a Bass on a Trout Swimbait a few days ago in a Lake with no Trout or history of stocking.

Dave

When choosing a swimbait you should look for a quality proven bait that resembles the big bass prey the closest. by going with quality proven baits you know it will have fish catching action, the next thing to do is match the size and color. However this does not mean they wont eat this or that color. Bass will eat a trout colored bait anywhere.

if all you have is trout colored bait and  your lake is full of golden shinners then throw the trout, but if your shopping for a bait I would buy the shinner colored one.

another way to look at it is, if your non trout lake was stocked with a 1000 8in trout do you think your bass would eat them? You bet they would.