I get a sucker!

We've started potty training Crue. I had talked to a friend of mine to find out how she had potty trained her boy and am now doing the same thing with Crue. I take him every half hour and so far he has stayed dry as long as I take him (the time will gradually increase). He struggles with going poop though. He's done it before in the toilet but for some reason he won't do it now. He hides and does it in his underwear or diaper (he only wears a diaper for naps and at night). We decided to try offering a sucker if he goes poop in the toilet because he likes those. Still hasn't gone. Last night I was going to the bathroom (sorry if this is too much:)) when Crue came in and asked what I was doing. When I told him he tilted his head and asked, "you det a suter?" (he says the d sound for his c's and g's). I was laughing so hard. I told him, "yep, I get a sucker."