Hi ADCISCO -- I think Speck and Spike are great names!
Also to try to answer the heater question -- I only have a 5 1/2 gallon tank with 2 bettas (well, one betta now

) I have a 25-watt heater in there. I really don't think that it's safe to have a heater in anything less than 5 gallons. I have seen small, 10-watt or so heaters in Wal-Mart that say they are for small bowls, but I have not seen them in the pet stores, and I don't know how safe they really are. As far as the light keeping the water warm -- yes, it will, but when you turn off the light at night, the temp will fall, and they may be sensitive to that drop. That's one reason I got my bettas out of the bowls and into this tank so I could give them a heater. They were in one-gallon bowls, and it couldn't maintain the temperature. Your situation may be different, though. You should get a thermometer so you know how the temp. fluctuates. Look at the temp. after the light has been on for awhile, and then look first thing in the morning before you turn the tank light on.
Maybe -- I don't know for sure -- you could use a heated rock? I've seen them used for lizards, so don't know if they are ok for the frogs. If they would work, they could turn off and on during the day and night as needed to maintain the temp. Check this out at the
lfs -- because I've never had frogs and don't know for sure if they would like a heated rock!