He's super cute, congrats on your new boy! If you like the name Ollie (and I do too, I think it's a really cute name!), maybe his "full name" can be Oliver and you can use that when he's acting particularly feisty? That's what I did with my bearded dragon, his name is Stan but he gets called Stanley when he's acting up. It's like a parent using a kid's middle name and it just cracks me up. Mango is a really nice suggestion too, it suits him!