There is a path northwest of Wizard's house blocked by a log. Once you obtain a steel Axe you'll be able to break it down. Upon entering the path there are a few slime to fight, which leads to a small pond where Woodskip are quite the common catch. They can be caught in Spring during rain or in Winter during snowfall.
Normal, +25 energy, +10 health
Silver star, +35 energy, +14 health
Gold star, +45 energy, +18 health