Does Oanda and Forex.com offer micro lots like FXCM?

Short answer

They don't. It's minimum 10K lots = 1 EUR per pip for them

Better answer

However, they're compatible with Metatrader 4 and 5
On their specific versions of Metatrader, you should be able to trade with micro-lots

Reminder
A micro-lot is 1K lot = 0.10 EUR per pip
Which is better for new traders to learn

OANDA MT4

If you chose Oanda, you'll have to download their Metatrader version and downloading it from their website

Forex.com MT4

If you chose Forex.com, you'll have to download their Metatrader version and downloading it from their website

FXCM

Same with FXCM, with their specific Metatrader version