Snufffles can be found at the following locations.

Beetull Smash
Get the Beetull abilities. There is a rock platform stranding in the middle of the open area at the third section where you are blocked by another red gate. Make Beetull Maw charge and ram that platform. This will launch the Snuffle that was on top of the platform down to the ground.

Bulb Valley
Immediately turn around when you start the level. Pull the grey giant rock out of the way to reveal a Snuffle trapped in a cage from the crashed Bounty Hunter ship. After Maw has eaten the Queen Bulbos and transformed into the energizing Maw, use the new ability to shock a Meeba worm. Take it back to the caged Snuffle. Hit the cage with the energized Meeba to disarm the cage.

ChainDown
After Maw gets the fire ability, burn the two fire plants blocking the secret path in the floor level canyon. It leads to another Snuffle.

Crash Site
There is another grey giant rock on the opposite side of the large area containing the three fire plants. You can use your leash to move it out of the way. Follow the now exposed path to where a Snuffle is grazing.

Dirtlands
Get the Pufftor balloon abilities. Enter the grey rock and water section past the mushrooms. There is an air duct blowing air to the left. Use it to reach another air stream that will blow you onto a small plateau where a Snuffle is trapped in a Bounty Hunter cage. Use the Maw's slam ability to break the cage.

Looferland
After Frank is riding Maw with the Loofer's laser abilities, shoot and destroy the large crashed ship section next to the green path leading to the next level area. You will now see an impact crater where a Snuffle is trapped in another cage.

Mesas
There is an air duct near the sensor tower. Get the Pufftor balloon abilities, then jump up onto a ledge above the air duct. Use the Maw's slam ability to get the Snuffle out of its cage.

Planet Maw: None.