I am getting ready to embark on a major pond remodeling. So major that the pond and everything in it are going to have to do. Oddly enough, I am most worried about evicting the frogs. Any suggestions on how to create a suitable winter retreat for them? I am in Michigan, so the winters are pretty cold (well below freezing for most of the season). The current pond is so overgrown, that there is a nice thick layer of muck at the bottom that the frogs have been enjoying for the past few years during the winter. Thoughts and/or suggestions? The one constant is that the existing pond hole will be filled in with dirt a year or so before the new pond will be created. Thanks