Jess I had the same problem with Angus! He'd do 10 little skiddy poos in his jocks some days and it drove me mental. I thought it was an attention seeking thing that he started after Caleb was born because he was previously fully TT.
I'd read him a story while he sat on the potty and if he did a poo there he got a chockie. A few times there I almost put him back in nappies.