Looks like a pretty checkered Garter. When he gets a little older, it’ll be easy to tell if it’s a boy or girl based on the tail. If he takes silversides, I’d keep giving him those. You can transition him to pinkies and he will grow fast (cut them up for him since he’s so small). You may have to mix the fish in with the mouse since they are very keen on scent.
Night crawlers are good; avoid red wigglers as they are considered toxic. Not sure what worms you have in your garden, but should probably be avoided anyways since they can have parasites.
Congrats. Garters are fun to watch and are active during the day. Their musk stinks, but they typically calm down with age.
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