Fabulouscazza,
Sounds like you have Ramshorn snails. Your bluetongue may eat them or may find the amount of shell to meat not to its liking. All you can do is try. If it does like them, then they will be good for it.
TheReptileben,
Garden snails (also known as European snails) are easy to collect. Take a wander around the neighbourhood after it has rained in the evening, or is drizzling, and you should find lots of snail out on the grass verges. Alternatively, go for a wander after midnight (with a good torch) and check the lawns that have had the sprinklers on. You can usually find most snails on the lawns adjacent to garden beds.
If you really want to breed them yourself, plant a bed of Agapanthus plants along side some lawn. Add a handful of snails and give it a couple of months. Keep your Agapanthus well watered during dry periods. You will be surprised the number of snails you’ll get.
You will often hear concerns about snails that may have taken baits. Simply keep all snails you have collected from areas other than those know not to use baits for at least three days. If they die, ditch them. If they are still alive then feed then to your lizard. Keep captured snails somewhere cool and never in direct sun. You can feed them on the green outer lettuce leaves that they throw out in the supermarket. Alternatively, butcher’s paper is suitable. A light misting once a day is all that is required. I use white plastic buckets covered with a piece of shade cloth held in place with tie wire. You can maintain a couple of hundred snails for a week or two in such a set up. For long term storage, about 50 snails max per bucket is what I would recommend. Also, for longer term storage, I would definitely add several loosely crumpled pieces of butcher’s paper to allow the snails to elevate themselves off their wastes.
Blue