The phrase "garden snail" refers to a type of snail that can be found in gardens. It describes a small creature with a spiral shell on its back that moves very slowly. Full definition
Ryan Reynolds voices the lead, an ordinary garden snail with not - so - ordinary dreams. (slashfilm.com)
Nail varnish, correction fluid and disco lights have revealed the impressive homing instincts of garden snails, as well as the best ways to get rid of them (newscientist.com)