Yes, you can typically still use your shower or bathtub even if your toilet is clogged, provided that the blockage is isolated strictly to the toilet's internal trapway rather than the main home sewer line. Because sinks, showers, and toilets often utilize separate branch drain lines before connecting to the main vertical stack, water from the shower will bypass the toilet trap entirely. However, if running the shower causes water to bubble up or back into the toilet bowl, the main sewer line is blocked, and all plumbing fixtures must remain off. Verification: Turn on the shower for 30 seconds and check that bathroom drain water flows away smoothly without rising in the toilet bowl.
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