He probably hopped less than a few feet
Most escaped pets reward a wide search; a pacman frog rewards the opposite. This is a heavy, round ambush predator built to sit in one spot in the leaf litter and wait for dinner to walk past, and out of his tank he behaves exactly the same way: a few short hops from the enclosure, then a determined dig down into the first loose, damp substrate he lands in. Owners routinely find an escaped pacman frog within a small radius of the tank, buried to the eyes in a houseplant, while they are busy emptying closets in the next room.
Begin there, on your knees, and work outward slowly. Close the door so the radius stops growing, and keep cats and dogs out of the room entirely.
Soil, pots, and damp corners
Search by touch, gently, because a buried pacman frog is invisible: what you are looking for is a spot where the soil surface has been disturbed, a shallow circular depression, or simply the frog-shaped firmness under your fingertips. Go through every plant pot and tray within hopping distance of the enclosure, sifting the top layer of soil with your fingers, and check under the enclosure stand, behind it, and in any spill of substrate or leaf litter on the floor. Then widen to the damp architecture of the room: behind large plants, under low furniture near water sources, along any wall where condensation or a pet's bowl keeps things humid.
Lift objects straight up rather than dragging them — a frog buried at the edge of a pot or a box is precisely where a dragged corner lands. Check inside watering cans and buckets kept near the tanks; a frog who hopped in after moisture cannot always hop out.
Water is both lure and lifeline
A pacman frog out of his substrate is losing moisture, and dry indoor air is a genuine threat to him within a day or so, which makes water your best tool in both directions. Set a wide, shallow dish of dechlorinated water on the floor near the enclosure and a second near the dampest corner of the room, with a damp paper towel draped at one edge as a ramp and refuge. A frog seeking moisture will find one of them, and a frog found soaking is a frog rescued before the drying did harm.
Repeat the soil search at dusk, when he is likeliest to surface and reposition, and keep the room's humidity in mind — if the house is very dry, run the search with more urgency than the frog's calm reputation suggests.
Wet hands, low dish, home again
When you find him, wet your hands with dechlorinated water first — dry skin and the salts and lotions on human hands are genuinely bad for a frog's permeable skin — then scoop him from below, supporting his whole round weight, and set him in a low dish of shallow dechlorinated water while you check him over. Soil-caked and grumpy is normal; then return him to a cleaned enclosure with fresh, damp substrate and let him dig himself back into his life.
Check the lid and screen afterward: pacman frogs cannot climb glass, so an escape almost always means a lid left ajar or knocked aside, the easiest fix on this list. If yours instead hopped out during cleaning near an open door and reached the garden, search the soil under the nearest dense plants that same evening, and let the neighborhood help: KinsLe's Lost Pet Alert System alerts nearby pet lovers for free, so a neighbor who uncovers a very round frog under a flowerpot can message you directly.