My T does. We have not used them, but I would be ok with it. Her agency works with kids a lot, so every clinician has toys and art supplies (as far as I can tell). We have busted out the crayons though, and talked a bit about one of the stuffed toys she has in her office.
I like the idea because words often fail me. The toys, games, and art stuff give me a way to break out of a freeze response. It also helps me get past not having words for a lot fo stuff. There's a sense of comfort in a way (though I can't figure out exactly why). We did talk about it last session though, at least in the sense of explaining that my wife and I are still very much in touch with our "kid" side, and we love spending time with kids.