What to do with starvation tokens?
There is no way to get rid of starvation tokens but they only cause a loss of morale when there is not enough to food to eat for that round. In that situation, you would lose 1 morale for each starvation token in the food supply.

This is covered in the rules in the section that describes the Pay Food section of the Colony phase. The rules indicate that in the situation where you do not have enough food in the food supply to feed the colony, you do not remove the food, but instead add a starvation token and then decrease morale for each starvation token in the supply.

This was further confirmed in a forum discussion on BoardGameGeek that involved Johnny Gilmour, one of the game designers.