I found some information about cryptocurrencies that are traded simultaneously on the three exchanges you mentioned: TapBit, TradeOgre, and CoinEx. Below are examples of coins that are available across all three platforms:

1. **BNB (Binance Coin)** - This coin is listed on TapBit, TradeOgre, and CoinEx.
2. **Dogecoin (DOGE)** - Another popular coin that trades across these exchanges.
3. **Polygon (MATIC)** - Available on TapBit, TradeOgre, and CoinEx, showing its wide adoption.
4. **Bitcoin Cash (BCH)** - BCH is also traded on all three platforms.
5. **Solana (SOL)** - Listed on all three, reflecting its significant market presence.

These cryptocurrencies are among those that have sufficient liquidity and popularity to be traded on multiple exchanges simultaneously. Keep in mind that market availability can change, so it's good practice to check the specific listings on each exchange regularly.