Hi this is my build that i use. Naut is my main jungler and i have good success with this build. I am new to this website. If i can come back in and edit this post i will add more later

Order
1 Start with cloth and 5 pots
2 stay in jungle and gank as much as possible
3 first buy heart of gold and boots
4 upgrade boot to boots of mobility and buy health pots if you think you need them
5 build negatron cloak and Glacial shroud in the order of damage you are taking more of
6 after building both then rush a warmong's armor
7 upgrade to a frozen heart and force of nature again in the order of damage taken
this should give you enough durability
8 next have some fun! build a Nashor's tooth! give you attack speed boost for late game plus ability power for his W along with more mana regen and cooldown! this is an amazingly fun item to have

9 Typically i dont get to build a 6th item, game is usually over, but i would sell the heart of gold for a sunfire cape or atam's Impaler. Otherwise upgrade the heart of gold to a locket of the iron Salari or Randuin's Omen... up to you

This is my build for a jungle Naut

my skill sequence might be a bit messed up...but follow what i have for the first 4 levels for sure! then max out Titan's wrath first, W, then Riptide, E, lastly Dredge Line, Q. As always take Depth Charge, R, when you can at levels 6,11, and 16. I think when you play my sequence is messed up at levels 13 and 14 cant remember right now