But how many of those are good for food as well? Plus Adam & Eve were not said to be children. Adam is canonically highly intelligent, as he receives divine commands and names animals according to their nature. (Eve is implied to be just as intelligent).
Could, but why should he? Unlike Eve, the garden wasn’t necessarily created for Adam’s benefit (else why would the divine punishment be expulsion?), and I think the tree probably wasn’t, either.
~Max