The dovetail saw is a small light handsaw that still has a place as an every day bench tool. I would draw a difference between a dovetail saw that is exclusively used for thin light material , drawer sides back and front and a carcase saw.
The dovetail saw would have 15 to 22 TPI or tooth per inch. It would have a rip or flame cut tooth line Fleam is where a rip tooth line has been sharpened to lay the tooth back slightly to make it a less aggressive cut.
The carcase saw is a very very similar saw but maybe slightly longer and with a slightly more aggressive set of the toothline. This saw will cope with 20 mm thick carcase stuff with ease. It is not used for dovetails