Pampers Baby dry diapers, Huggies Snug and dry diapers, Luvs Ultra leakguards, Pampers Swaddlers overnights and Seventh Generation Free and clear diapers are all good overnight diapers for babies and Toddlers.
My 2 year old son wears Huggies Snug and Dry diapers overnight and they hold up good for his heavy wetting.
But all toddlers are different and some diapers work better for some toddlers than other diapers do so you may have to try different brands of disposable diapers for your toddler to get the best performance.
If disposable diapers don't hold up for your toddler at night then you might try cloth diapers as they tend to work better for overnight for some toddlers when disposables don't work as good.