No, the treasure is level locked at level 100.
Here are the list of treasures I've confirmed to be NOT obtainable:
Crazy Carrot - 1000 Draenic Seeds (Herbalism) (req level 96 and intro quest)
Kaliri Hatchling - Vesharr, Spires of Arak, 10G (need to win pet battle against vendor)
Hydraling - Varasha's Egg, Spires of Arak, 100% (does not drop)
Shard of Cyrukh - Forgotten Shard of the Cipher, Tanaan Jungle (questline req)
Throbbing Blood Orb - Looted Bleeding Hollow Treasure, Tanaan Jungle (questline req)
Jewel of Hellfire - Jewel of Hellfire, Tanaan Jungle (req level 100)
Dazzling Rod - Dazzling Rod, Tanaan Jungle (req level 100)
Podling Camourflage - Strange Green Fruit, Tanaan Jungle (req level 100)
The Perfect Blossom - The Perfect Blossom, Tanaan Jungle (req level 100)
Brazier of Awakening - Tanaan Jungle (req level 100)
Accursed Tome of the Sargarei - Tome of Secrets, Tanaan Jungle (req level 100)
Skull of the Mad Chief - Tanaan Jungle (req level 100)
Star Chart - Astrologer's Box, Shadowmoon Valley (req level 90)
Umbrafen Spore - Strange Spore, Shadowmoon Valley (req level 90)
Angry Beehive - Swamplighter Hive, Shadowmoon Valley (req level 90)
Vindicator's Armor Polish Kit - Vindicator's Cache, Shadowmoon Valley (req level 90)
Ancient's Bloom - Yggdrel, Shadowmoon Valley, 93.45% (three kills on three separate days without drop)
Crimson Spore - Strange Spore, Gorgrond (req level 90)
Goren Garb - Warm Goren Egg, Gorgrond (req level 92)
Fruit Hunter - Wiggling Egg, Frostfire Ridge (req level 90)
Arena Master's War Horn - Arena Master's War Horn, Frostfire Ridge (req level 90)
Iron Buccaneer's Hat - Captain Ironbeard, Nagrand, 99% (three kills on three separate days without drop)
Blazing Firehawk - Order of the Awakened Exalted - 2,000 Apexis Crystals (vendor not available)
Rukhmar's Sacred Memory - Order of the Awakened Revered - 50,000 Apexis (vendor not available)
List of items I suspect are not obtainable but cannot/have not confirmed 100%:
Netherspawn - Netherspawn, Nagrand, 94.83% (two kills on two separate days without drop)
Brilliant Spore - Rotcap, Spires of Arak, 99.93% (two kills on two separate days without drop)
Deceptia's Smouldering Boots - Deceptia's Smouldering Boots, Talador (req level 94?)
Giant Deathweb Egg - Curious Deathweb Egg, Talador (req level 94?)
Stonegrinder - Ketya's Stash, Talador (req level 94?)
Special mention:
Nightshade Sproutling - Disturbed Podling (Herbalism), 0.19% (req level 75 but may be possible through rollable group loot)