Near Rhymes:
* Tubby's (slightly off, but works if you're talking about a singular Teletubby)
* Rubies (not quite perfect, but has a similar sound)
* Cooties (a bit of a stretch, but the "oo" sound is similar)
Eye Rhymes (Rhyme visually, not phonetically):
* Babies (looks like it rhymes, but doesn't sound the same)
* Sobbies (similar spelling, but a different pronunciation)
Other Options:
* Tubby (if you need a one-syllable rhyme)
* Fuzzy (describes the Teletubbies' texture)
* Sunny (relates to the Teletubbies' environment)
Ultimately, the best rhyme depends on the context and your creative license!