FAQ for Ribbit
Various clarifications consolidated into a wiki page so that people can more easily find all the info in one place and update it.
List of game FAQs
Q: What if a turtle moves backward into the start space? Does it stack onto a turtle there?
A: No. Turtles in the start space are never stacked, always separate.
Q: Can a minus card be played on a turtle in the start space?
Q: What if all turtles are in the start space and a player only has minus cards?
A: Unknown. A plausible option is to say discard and draw another card as the turn action. It's rather unlikely to happen anyway. :)