Hi, Maddiepie!
I have seen (and own a couple of) the Petstages toys that you can freeze. One of the ones I have is a blue tube that narrows towards the center and it has several small ropes running through it with a large knot at each end (so that the ropes can't come out of the tube). Chloe is 18 weeks old so she is going through her teething stage, and I tossed this particular toy in the freezer for about 45 minutes or so thinking she might enjoy the colder temperature on her gums. Nope...she didn't want anything to do with it!! Granted, Chloe doesn't like ice cubes and she won't drink her water if it isn't at room temperature. Anyway, all that to say, the toy was definitely easy to freeze and it wasn't messy at all. No liquid or gel or anything in it, just the plastic gets cold.
As to the popsicles, I know the kind you are talking about and Chloe loves to chase the end of the plastic around when I'm trying to eat one. However, she also tries to chase the end of my husband's toothbrush when he is brushing his teeth. So, for her, I think it is more the movement she's after!
-C |