Wow, they are so adorable! (The hamsters in the pictures and the video). My favourite picture is the first one. <3 Oh, it's very good that they are doing so well!
HamstermadHammy, Nibbles loved to chew on this toy:
http://www.wag.com/smallanimal/p/ware-n ... all-114591 You just have to make sure that if you buy one that has a bell inside, you need to remove (and replace) it as soon as the grass around the bell has been chewed through (and the bells is showing), you don't want the hamster to choke on the bell or something. ^^; It usually took Nibbles more than 5 months to chew through one.
I also bought some wooden sticks for him to chew on. I made him a few toys with (empty) tissue boxes and (clean) cardboard boxes as well. ^^ Hope that helps? If not, I hope you can find some great toys for Trixie!