Loves to play but doesn't like toys

Hey yall, my little buddy Cosmo (4.5 yo, half husky half corgi) loves to play, but he has absolutely 0 interest in toys. I've has him for about 2 years now and the only time he's ever played with a toy was the very same day I started taking care of him and it was a tug-of-war rope, and never touched it again. He loves to play in the snow, wrestle, run, chew on sticks (he doesnt chew on anything else), and getting into mischief. I'd love to buy more toys for him because I get the feeling he's really bored at home. I don't have a lot of expendable income and I'm worried about buying a bunch of toys that he'll never use, so Im looking for some suggestions that have worked for people in a similar boat, whether it be finding more stimulating toys, helping him find joy in playing with them, or maybe it's just his personality to not gravitate towards them. And advice helps, thank in advance!