In this context, "slime" refers to a separate thing called "黏土" (niantu) in Chinese, which means "clay." It does not refer to "浑水" (hunshui), which means muddy water, or "污水" (wushui), which means dirty water.

Example sentences:
1. 孩子们正在享受制作黏土的创意体验。 (Háizi men zhèngzài xiǎngshòu zhìzuò niantu de chuàngyì tǐyàn) - The children are enjoying a creative experience of making clay.
2. 我们在这里提供黏土工艺课程，让孩子们尽情发挥创意。 (Wǒmen zài zhèlǐ tígōng niantu gōngyì kèchéng, ràng háizi men jìnqíng fāhuī chuàngyì) - We offer clay art classes here, allowing children to unleash their creativity.

I would use 橡皮泥.
https://www.amazon.com/Pack-Dual-Color-Slime-Toy/dp/B0C9J2DP...

常见两种含义

如果是网上游戏，那就是史莱姆，史莱姆通常是游戏开发人员设计的一种软体凝胶小动物或小怪兽。有的游戏会叫“粘液怪”。
https://zh.wikipedia.org/wiki/史莱姆

如果是玩具，它也叫史莱姆，又叫“水晶泥”。史莱姆也可以指一种粘稠的、可塑的玩具，通常由胶水、硼砂等材料制成。这种玩具可以随意揉捏、拉伸，深受小孩喜爱。在淘宝找了个链接给你看看：https://detail.tmall.com/item.htm?ali_refid=a3_430582_1006:1...

不管是哪种情况，用“史莱姆”都对