According to Fitday.com, 10 cherry tomatoes have 6.7 total grams of carbs and 2g of fiber, for a net carb count of 4.7g. If you want to find cherry tomatoes (or other types of tomatoes) on Fitday, just search for "tomatoes, raw" and look for the different types (cherry, grape, slices, etc.) in the drop down menu next to the Amount field.
As for the peanut butter, no, nuts are not allowed on Induction. However, sugar-free peanut butter is allowed a couple of weeks into OWL, so you're not too far away from that!
To see which foods are allowed during Induction, check out the Acceptable Foods page at
http://www.atkins.com/Program/FourPhases/WhatIsInduction/AcceptableFoodsList.aspx However, I don't find Atkins' carb counts to be particularly accurate, so I'd verify them against another site, like Fitday.
Hope this helps!
Laura
