First when it comes to toys-
I would honestly recommend staying away from rubber! (such as pacifiers
) Rubber is the #1 cause of blockages in ferrets & could cost them their lives
In my experience ...
tennis balls were a favorite
empty card board boxes turned upside down
accordian dryer tubes (there actually is one made just for ferts)
fleece cat balls
most cat toys (especially the mice & the balls that make noise - but not the open plastic ones)
Quite often you can find stuff around your house which makes for cheap toys- large cereal boxes, empty oatmeal containers with both ends cut open, a "dig box" which is made by using a plastic bin & filled with white rice (not instant!) or shredded paper (some people even use sand but I find it much harder to clean up)
Just use your imagination- if they can hide in it they will like it! If it makes noise (bells, plastic crinkling, rattles, etc) they will probably like it.
Just remember to inspect all toys daily for wear & tear & try to stay away from rubber & soft plastic as these are both cause for blockages. (although if destroyed anything is cause for a blockage which is why you should inspect daily.)
I do not have my ferrets anymore
but am more than happy to offer advice & suggestions if I can
Good Luck with the toys... you can NEVER have too many for them!