What if I did this....?
Humans do seem to be very smart, and humans do seem to be very innovative.
This could be for a variety of cumulative reasons, like we live on dry land (fire) AND have manipulative digits AND pass on knowledge through generations in written form AND have abundant food (agriculture) AND have had all these things for thousands of years. Look back 50,000 years (a blink in evolution) and we don't look so clever.
Various animals have sophisticated hunting techniques, and dolphins sometimes even work together with humans (without us having trained them) to get catches of fish, which the humans share with the dolphins. Octopi can open containers to get food contained within. Monkeys and apes can use simple tools to carry out tasks. They had to invent these techniques from scratch, and I think they show plenty of smarts and inventiveness in doing so. Our ancestors were arguably more intelligent than current humans, but had a much less sophisticated society.
So what animals seem to lack is a good means to effectively spread the things they figure out to many new members of their species, and maintain skills requiring complex manipulations that can't easily be demonstrated and observed. They also lack a motivation to spread that knowledge if they had the ability to.
So if you could spread knowledge from individual to individual by some means, you might allow a clever animal like a monkey or octopus with the appropriate manipulative digits to transfer information that would allow them to take advantage of past innovations. This building on prior knowledge would allow innovations to be preserved and built upon.
Imagine, for example, if Octopi memory were inherited from parents. All the life experiences are copied chemically and passed on from mother to child during gestation. The animal that learned to open shells with sharp rocks passes on that skill, and the next animal figures out how to sharpen rocks. The next figures out which sharp rocks stay sharp longer. And so on, and so on. Cooperation would be a critical step towards a species controlling their environment, but this is outside your requirements. Individuals watching other octopi could learn new skills by observation, and pass on the knowledge to their extremely precocious offspring.
Soon you have octopi farming shellfish and lobster, cooking their food at thermal vents, feeding the females while protecting eggs to improve survival. All without a language with more than a few chromophores to signal each other.
You might need the octopi to develop a language to develop a full civilization. But to simply innovate, definitely not. And if you can somehow transfer knowledge from one generation to the next without language, then you could certainly develop technology of sorts. Lacking communication, such a species might actually end up being smarter and MORE innovative than us to compensate.