Indeed they are. In fact, Frogatto is the only one I'm unfamiliar with, so I'll have to give that a go shortly.
Best platformers +5 for robot wants kitty - simply brilliant Also try Archibald's Adventures, Crystal Caves (the series) Bounding 1 and 2 Rollo 1 and 2 Giana Sisters There are lots! Let me know what you think
Surprised no one mentioned Bubble Pig yet, there are a lot of secrets, you can make combos while collecting stuff, and more