Hanging bird toys are always great for degus, especially ones that can be shredded and/or contain different types of wood and textures. Bird ladders and perches can give your degus more room to play.
Try a variety of chew toys to see what your girls prefer
. Mine liked willow (you can get willow twigs, balls, baskets, etc.), yucca, cholla, and apple branches. Some degus will gnaw on pumice stones, too.
"Puzzle" toys are great for keeping degus occupied. There are some commercial ones (the Nut Knot Nibbler comes to mind) but it's also easy to make them yourself. For example, I often stuffed hay and some treats into a brown paper bag and then tied it shut. My degus had a blast shredding the bag and finding the treats. You can do something similar with a cardboard tube (from toilet paper or paper towels), just fold the edges over so they have to chew through it.
Try a variety of chew toys to see what your girls prefer
"Puzzle" toys are great for keeping degus occupied. There are some commercial ones (the Nut Knot Nibbler comes to mind) but it's also easy to make them yourself. For example, I often stuffed hay and some treats into a brown paper bag and then tied it shut. My degus had a blast shredding the bag and finding the treats. You can do something similar with a cardboard tube (from toilet paper or paper towels), just fold the edges over so they have to chew through it.