Gachagacha are small toys that are sold in small vending machines like those that dispense bubble gum. The sound you make when you turn the handle is called "gacha gacha" in Japanese, so we call small toys from those machines "gacha" or "Gacha something". They are so popular in Japan that there are "gachagacha shops" that sell only gachagacha toys. Most toys are figurines of superheroes, characters from manga or SF movies and some are joke items, for example this DOGEZA key chain. (What is dogeza?)
Personally, I have never bought gacha and I don't need any, but tonight I found one that I really want. Kiko+ is a brand for kids. Their wooden products are very unique and even I want some. This is their version of gachagacha.
These are Japanese sandals called "Geta". Geta usually have two supporting pieces below the base board called teeth. But this geta for kids has teeth that make animal footprints. So cute!