I do sympathize

but at the same time am secretly quite jealous, Humph never wants to do anything these days that doesn’t involve food

Will Molly search for things? I started by hiding treats under cushions etc but he very soon „advanced“ to toys etc.which I hid in another room, sometimes in a basket with a towel on top. I realize Molly‘s still only a a baby but Humphrey picked up on it really quickly and was quite happy to sit and stay while I went off to hide something. He‘d shoot off in a frenzy, nose clicking like mad and after 10 minutes he‘d be flat out!!

An old long towel or rag with lots of knots tied along it with treats hidden in the knots lasts a bit longer than a snuffle mat.
Another idea is an open plastic bottle with a hole on each side (about in the middle) through which you pass a stick so you can spin the bottle on the stick, - you can either hold it in two hands or support it on something. Put a treat in the bottle and see how long Miss Molly needs to figure out that by spinning the bottle, the treat will come out.
Cardboard Boxes full of screwed up newspaper with a few treats interspersed into the paper is a cheap albeit messy passtime. Empty toilet rolls standing side by side in a box with a few treats hidded in some of them….
Have fun!
