You can find a lot of articles about this online. The short answer is that it's very unlikely: kids who haven't acquired a language yet (including so-called 'feral children' who, for usually tragic reasons, haven't acquired a first language even at a relatively late age) still presumably can think.

A more reasonable question is whether your language influences the way you think. That proposal is [a version of] the Sapir-Whorf hypothesis (also called the linguistic determinism hypothesis). It has been, for the most part, debunked; the language you speak doesn't have a massive effect on the way you think overall (see, e.g., John McWhorter's The Language Hoax for discussion), although there may be some subtle ways that language influences the mental organization of certain concepts (for example, the psycholinguistic evidence about color words seems rather convincing), although saying that concepts are organized/represented in a slightly different way is quite a subtle and limited effect and doesn't entail that these people ultimately "think" in a very qualitatively different way.

I would like to quote the famous -Cogito ergo sum which is a Latin philosophical proposition by René Descartes "I think therfore iam" .But infact its the other way around: we think because we exist.We start existing even before the cognitive development begins in our lives.A thought is born out of memory .A mind is capable of functioning both in the dimension (language) created by humans for easy communication and also the dimension beyond , where there is no need for cognition or thought process (language),paradoxically the mind itself.