Toilet bubbles when tub drains could be from stuck toy in tub overflow?
The bubbling sounds like it's trying to get the air it needs to drain. Kind of like holding your finger over thr the top of a drinking straw and then lifting it out of the water. The water won't drain out until you lift your finger off the straw, allowing air to come in so the water can drain out. If the vent is clogged it could cause this. Squirrels dropped walnuts down mine and clogged it. The vent is the pipe that goes up through the roof, nearest to the toilet and shower. If the shower drain vent line is clogged it is possible that it could be sucking the air it needs through the toilet, sometimes actualling pulling the water out of the toilet. This is not very common but it can happen. If you can get on the roof and get a garden hose into the vent line(s), you can tell if it is clogged because water won't drain, it will come back out. You should be able to turn the water on full blast and it will drain normally if the vent is clear. It's possible that there is a connection between the toys and your problem, and the way you access that drain line is usually thru the wall on the opposite side of the shower controls/drain. I would start by running water down the vent lines on the roof. Good luck.
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