The smallest and largest drums without snares, octobans and gong drums respectively, are sometimes considered toms. The naming of common configurations (four-piece, five-piece, etc.) is largely a reflection of the number of toms, as only the drums are conventionally counted, and these configurations all contain one snare and one or more bass drums, (though not regularly any standardized use of 2 bass/kick drums) the balance usually being in toms.
Maybe you've already got a specific brand in mind and want to see all the digital pianos they offer. All you have to do is click on the brand on the left hand side of the screen and within a few moments you'll have access to everything that's available. For that matter, you can always play is safe and stick to the top-rated items…and there are plenty of those in this selection.