You beuty!
Large skink. Moves very fast. This is approximately 35cm as you see, it's longer than the width of the coir mat. Is this a land mullet? Hard to get close to photograph it as it's very skittish.
Limnodynastes peronii (Striped Marsh Frog) & Crinia signifera (Common Eastern Froglet) recorded near Mount Glorious, Queensland, Australia.
Recorded with iPhone SE.
FrogID recording 60053.