Anything can be currency. The state can ban the use of a paper or metal currency and create one in which apples are currency. Currency doesn't have to be banned (although many communists will say it should) but if you're like me, you do see a flaw in a society with no form of currency. I would much rather have an apple currency, because apples can't be hoarded the way paper can be.
So...is this communism or just your personal beliefs? Or are you just defining communism to be whatever you believe?
That's like saying that Barack Obama isn't a real Democrat because he hasn't been able to implement every single Democratic policy. If someone's end-goal is to establish communism, you can't really claim they aren't a communist, even if they don't able to perfectly execute all of their ideas.
It sounds like you're contradicting yourself, but I'll try to address...this.
So...everyone would only be allowed to eat and use what they grew and would be banned (at the threat of tribal violence) from trading their crops? Or, all of the crops people grew would just be taken by the "tribe" (which sounds a lot like a state), divided by the number of people in the tribe, and distributed equally by the tribe (which totally isn't a state) to every person?
Aside from the fact that people would have practically no incentive to produce under this system (as opposed to capitalism where people have an incentive to produce things that people want so they can sell them), you realize this would basically revert society to a primitive agrarian state? "Free medicine" wouldn't even exist because modern pharmaceuticals would be impossible to produce. It would be impossible to combine and change natural resources to make new things if everyone could only use what they grew directly from the earth...or would the state (sorry, tribe) take natural resources that tribe-members grew/extracted from the earth and then use them to make new things? If so, how would it determine which things to produce using natural resources?