Here are the teenage versions of Spiral and Toasty. Spiral is big and burly, Toasty has a more slender build.

With Toast I'm contemplating keeping her wingless. It seems strange that Spike is the only dragon on the show without them. Even in his full grown form he lacks them. So maybe wingless dragons are just an alternate breed. Like pegasi and earth pony? Either way, I think it would be interesting if Garble had to make peace with the fact that one of his children never sprouted any wings. Garble is also over protective of his wingless daughter. Not that she needs them though, Toasty is quite agile and has an impish, playful attitude. As of now I want to make her a dancer. An exotic teen dragon dancer? Hmm…

Spiral has his dad's attitude, boorish and rude. Though unlike his dad, Spiral's exposure to ponies at a young age did something to curve his attitude. So at the very least, he values a friend. Even pony friends, just don't expect hugs. And yes Spiral does have a neck. In theory.
As far as future exploits are concerned, I'm not quite sure what Spiral will do. I think it would be funny if he ended up becoming a babysitter just because in the Spyro games, you spent a lot of time rescuing babies. Babysitter/bodyguard?