Ah well i'm too late! ;P
Some of them you can get via event reward boxes. Usually anyways.
There's also a PVP battlefield movespeed fruit you can buy but only use in PVP/Battlefield. The red halloween candy increases move speed by a little %. There's also Marine nucleus which is 5%. I'm not sure but maybe one of the armor crafting sprites could craft a consumable which increases move speed.
I had to look up the database but Mom's Healthy Fruit Juice, Soaring Fruit, Healthy Vegetable Juice, Boo-Berry Halloween Candy, Purple Halloween Candy, Spoiled Chili Candy, Sugar Rush Halloween Candy. Those are some of the consumables. Most of them are event-gift bags but some of the fruits you can get via Seed Pouches and beating up the plant in Guild Base.
And i forgot to mention, you can get a title "Tower Assault" via beating Jarso Glimmershine Valley in 10 minutes when timed event starts. It gives 10% movement speed.