Crappies' Tip downs come with a cord attached to the rod. The fish can't pull them in. That is of course if you use the cord. I have a buddy that didn't use it and lost the rod. He also doesn't put a pin through the hole to lock the hitch on his trailer. That should tell you something....... Mrt.
If you are concerned about losing rods I recommend a new tip-up called the Finicky Fooler. You use a rod and reel combo and leave the bail open. The trigger can be set very sensitive for panfish and you can reel your fish in. I've already forgot to leave the bail open and had a pike hit and the fish did not pull the rod out of the holder.
Another classic option to use instead of tip downs are umbrella tip ups. I got some my grandpa made that were made back in the 50s or earlier and they still work great to this day. They are made from an umbrella hinge, a post, a few staples, a counter weight (usually something like a nut or washer), and sometimes a piece or fabric or something for a flag on one end. Just do a googler search of "umbrella tip ups". They work the same as tip downs unless you prefer using a reel with a rod.