Plain old toads dig holes like that in my garden. You can see their face looking out, but when they spot you looking at them as you walk past them, they back up a little deeper into the hole.
Gophers do leave mounds and any moles I've ever had leave a tunnel just under the dirt that you have to press back down before the roots of your plants dry up because they are in the air of the tunnel. Gophers might eat the plants, but the moles are looking for the extra worms and grubs that they can find in the richer garden soil,